#StackBounty: #facebook #facebook-pages Why does one Facebook page show a "Apps" sidebar section while another doesn't?

Bounty: 100

I’ve been trying to get to the bottom of this, but I’ve been unable to find any decent answer. After the layout change this fall, the Apps section box on the left side was replaced with a list of all page tabs.

However, some pages now have an Apps box in their right sidebar, and I’ve been unable to find out why it’s available on some pages but not on others. Going through the page settings lead me nowhere, and selecting “Edit” to rearrange the sidebar sections just show the three sections that is already shown on pages without the Apps section.

Example from page where the Apps section is available

Example where the Apps section in the sidebar is visible

Example from page where the Apps section isn’t available

Example without any Apps section

Anyone have any experience with why this happens? Is it an a/b test thingie, or have I missed how I’d enable this feature for both pages?


Get this bounty!!!

#StackBounty: #facebook #facebook-pages Why does one Facebook page show a "Apps" sidebar section while another doesn't?

Bounty: 100

I’ve been trying to get to the bottom of this, but I’ve been unable to find any decent answer. After the layout change this fall, the Apps section box on the left side was replaced with a list of all page tabs.

However, some pages now have an Apps box in their right sidebar, and I’ve been unable to find out why it’s available on some pages but not on others. Going through the page settings lead me nowhere, and selecting “Edit” to rearrange the sidebar sections just show the three sections that is already shown on pages without the Apps section.

Example from page where the Apps section is available

Example where the Apps section in the sidebar is visible

Example from page where the Apps section isn’t available

Example without any Apps section

Anyone have any experience with why this happens? Is it an a/b test thingie, or have I missed how I’d enable this feature for both pages?


Get this bounty!!!

#StackBounty: #facebook #facebook-pages Why does one Facebook page show a "Apps" sidebar section while another doesn't?

Bounty: 100

I’ve been trying to get to the bottom of this, but I’ve been unable to find any decent answer. After the layout change this fall, the Apps section box on the left side was replaced with a list of all page tabs.

However, some pages now have an Apps box in their right sidebar, and I’ve been unable to find out why it’s available on some pages but not on others. Going through the page settings lead me nowhere, and selecting “Edit” to rearrange the sidebar sections just show the three sections that is already shown on pages without the Apps section.

Example from page where the Apps section is available

Example where the Apps section in the sidebar is visible

Example from page where the Apps section isn’t available

Example without any Apps section

Anyone have any experience with why this happens? Is it an a/b test thingie, or have I missed how I’d enable this feature for both pages?


Get this bounty!!!

#StackBounty: #facebook #facebook-pages Why does one Facebook page show a "Apps" sidebar section while another doesn't?

Bounty: 100

I’ve been trying to get to the bottom of this, but I’ve been unable to find any decent answer. After the layout change this fall, the Apps section box on the left side was replaced with a list of all page tabs.

However, some pages now have an Apps box in their right sidebar, and I’ve been unable to find out why it’s available on some pages but not on others. Going through the page settings lead me nowhere, and selecting “Edit” to rearrange the sidebar sections just show the three sections that is already shown on pages without the Apps section.

Example from page where the Apps section is available

Example where the Apps section in the sidebar is visible

Example from page where the Apps section isn’t available

Example without any Apps section

Anyone have any experience with why this happens? Is it an a/b test thingie, or have I missed how I’d enable this feature for both pages?


Get this bounty!!!

#StackBounty: #facebook #facebook-pages Why does one Facebook page show a "Apps" sidebar section while another doesn't?

Bounty: 100

I’ve been trying to get to the bottom of this, but I’ve been unable to find any decent answer. After the layout change this fall, the Apps section box on the left side was replaced with a list of all page tabs.

However, some pages now have an Apps box in their right sidebar, and I’ve been unable to find out why it’s available on some pages but not on others. Going through the page settings lead me nowhere, and selecting “Edit” to rearrange the sidebar sections just show the three sections that is already shown on pages without the Apps section.

Example from page where the Apps section is available

Example where the Apps section in the sidebar is visible

Example from page where the Apps section isn’t available

Example without any Apps section

Anyone have any experience with why this happens? Is it an a/b test thingie, or have I missed how I’d enable this feature for both pages?


Get this bounty!!!

#StackBounty: #facebook #facebook-pages Why does one Facebook page show a "Apps" sidebar section while another doesn't?

Bounty: 100

I’ve been trying to get to the bottom of this, but I’ve been unable to find any decent answer. After the layout change this fall, the Apps section box on the left side was replaced with a list of all page tabs.

However, some pages now have an Apps box in their right sidebar, and I’ve been unable to find out why it’s available on some pages but not on others. Going through the page settings lead me nowhere, and selecting “Edit” to rearrange the sidebar sections just show the three sections that is already shown on pages without the Apps section.

Example from page where the Apps section is available

Example where the Apps section in the sidebar is visible

Example from page where the Apps section isn’t available

Example without any Apps section

Anyone have any experience with why this happens? Is it an a/b test thingie, or have I missed how I’d enable this feature for both pages?


Get this bounty!!!

System Design Interview Prep Material

System design is a very broad topic. Even a software engineer with many years of working experience at top IT company may not be an expert on system design. If you want to become an expert, you need to read many books, articles, and solve real large scale system design problems. This repository only teaches you to handle the system design interview with a systematic approach in a short time. You can dive into each topic if you have time. Of course, welcome to add your thoughts!

Table of Contents

System Design Interview Tips:

  • Clarify the constraints and identify the user cases Spend a few minutes questioning the interviewer and agreeing on the scope of the system. Remember to make sure you know all the requirements the interviewer didn’t tell your about in the beginning. User cases indicate the main functions of the system, and constraints list the scale of the system such as requests per second, requests types, data written per second, data read per second.
  • High-level architecture design Sketch the important components and the connections between them, but don’t go into some details. Usually, a scalable system includes web server (load balancer), service (service partition), database (master/slave database cluster plug cache).
  • Component design For each component, you need to write the specific APIs for each component. You may need to finish the detailed OOD design for a particular function. You may also need to design the database schema for the database.

Basic Knowledge about System Design:

Here are some articles about system design related topics.

Of course, if you want to dive into system related topics, here is a good collection of reading list about services-engineering, and a good collection of material about distributed systems.

Company Engineering Blogs:

If you are going to have an onsite with a company, you should read their engineering blog.

Products and Systems:

The following papers/articles/slides can help you to understand the general design idea of different real products and systems.

Hot Questions and Reference:

There are some good references for each question. The references here are slides and articles.
Design a CDN network Reference:

Design a Google document system Reference:

Design a random ID generation system Reference:

Design a key-value database Reference:

Design the Facebook news feed function Reference:

Design the Facebook timeline function Reference:

Design a function to return the top k requests during past time interval Reference:

Design an online multiplayer card game Reference:

Design a graph search function Reference:

Design a picture sharing system Reference:

Design a search engine Reference:

Design a recommendition system Reference:

Design a tinyurl system Reference:

Design a garbage collection system Reference:

Design a scalable web crawling system Reference:

Design the Facebook chat function Reference:

Design a trending topic system Reference:

Design a cache system Reference:

Good Books:

Object Oriented Design:

Tips for OOD Interview

Clarify the scenario, write out user cases Use case is a description of sequences of events that, taken together, lead to a system doing something useful. Who is going to use it and how they are going to use it. The system may be very simple or very complicated. Special system requirements such as multi-threading, read or write oriented.
Define objects Map identity to class: one scenario for one class, each core object in this scenario for one class. Consider the relationships among classes: certain class must have unique instance, one object has many other objects (composition), one object is another object (inheritance). Identify attributes for each class: change noun to variable and action to methods. Use design patterns such that it can be reused in multiple applications.

Useful Websites

Original Source

HackerRank: Continuous Sequence Sum Test

Question:

Given a sequence of positive integers A and an integer T, return whether there is a continuous sequence of A that sums up to exactly T
Example

[23, 5, 4, 7, 2, 11], 20. Return True because 7 + 2 + 11 = 20
[1, 3, 5, 23, 2], 8. Return True because 3 + 5 = 8
[1, 3, 5, 23, 2], 7 Return False because no sequence in this array adds up to 7


Solution