Old Version Of The Facebook Lite Application – In June 2015, we released Facebook Lite, our version of Facebook for Android, built for emerging markets. We are happy to announce today that the app has hit 100 million monthly active users. It was the fastest version of Facebook to reach 100 million users in less than nine months. It has an APK size of less than 1MB, which means people can download it in seconds with slow connections. The program currently supports 56 languages and is most popular in Brazil, India, Indonesia, Mexico and the Philippines.
It’s important to us that everyone has a great experience using Facebook on their phone, regardless of device or connection. Due to different network and hardware requirements, experiences may vary. Although 2G mobile networks cover up to 96 percent of people worldwide and are used by more than half of the world’s population for basic data connections, at least 1.6 billion people still live in areas without access to mobile broadband networks (3G and 4G). . Difficult access. Even for those on 3G networks, disconnection and connection stability are often the biggest obstacles to providing a good mobile experience.
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Through our research in emerging markets and how people use our applications, we know that the value of data and the overall use of data is very important to people. So we’ve worked to reduce data usage when people in emerging markets want to access Facebook. In addition to continuing to improve the way the Facebook app for Android works on 2G networks, we launched Facebook Lite in 2015 to address these issues. Our goal at launch was to provide a simple, fast and authentic Facebook experience to people in emerging markets using standard Android phones and network connections.
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With these limitations in mind, we chose a very thin client proxy server architecture. We optimized it for Android using the success of Facebook’s every phone architecture as a starting point.
To meet APK size targets, simple APKs lack the production code and resources found in a typical Android app. Client Lite is a simple VM that provides various capabilities to interact with the operating system (such as reading files, opening cameras, creating a SQLite database, etc.) and deploying an engine to run the Android UI. The production code is written on the server and defined according to the client’s capabilities. Resources are sent from the server as needed and cached. So it has unlimited scale to build more products without sneezing the apk.
The Lite architecture is designed to do heavy work on the server side, allowing the program to run well on very weak devices like the LG Optimus ME. The server retrieves the information from the Facebook help desk and sends the screen to the client in the form of a compressed UI tree similar to the DOM. Since a client can only talk to one server per session, the server can push data to the client other than the client.
Instead of using HTTPS, it uses a custom messaging protocol over TLS (directly over TCP). Compressed messaging is done using a persistent TLS connection that the client establishes with the server for the session. This design opens the door to many optimizations that help reduce data usage and work in 2G networks.
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Lite has a set of image servers that talk to CDNs and other image repositories to allow the server to serve the right sized images to the client.
Downloading a typical app with a 20MB APK can take more than 30 minutes on a 2G network, and the download can fail due to network failure. Limiting the size of our APK makes it easier for people to download it. It also means that people need to use less data to improve the application. That is why we have taken great care to reduce the apk size of the application. As mentioned earlier, the client-side application is a generic VM and the production code resides on the server. Elements that tend to clutter APKs, such as string definitions and PNG resources, are downloaded and cached from the server on demand instead of built into the APK. In various places, we use Unicode symbols instead of image resources to represent icons, to save data and size.
The Lite network stack facilitates operation on 2G networks and reduces data usage. Instead of using HTTPS, Lite uses a custom message protocol over TLS (directly over TCP) to achieve a super-byte-efficient wire protocol. One of the biggest pain points in the 2G network is that establishing a connection can be very slow; It may take several seconds. When most of the lightweight traffic flows over a single connection to the backend, this pain point is reduced in comparison.
A dynamic compression dictionary is applied to messages in a session, taking advantage of the fact that the client is repeatedly talking to the same server. We use LZMA2 compression for server-to-client messages because of its high compression ratio and low resource usage due to decomposition. We use DEFLATE for client to server messages.
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Tools like Augmented Traffic Control and Internet.org Innovation Lab are tools for our engineers to test 2G networks in real scenarios.
Most of the app’s data usage comes from images, so this was one area where we wanted to reduce data usage in the app. We control the size of the images in order to control the amount of data used. The Lite server knows exactly the screen width, height and density of the client’s screen. Instead of talking directly to the CDN, the Lite client receives real-size images from the Lite server over the same TCP connection. Instead of using some supported sizes available in the CDN, the server can adjust the JPEG quality of the images and adjust the images to the desired size. The current size and quality improvements of JPEG make many images smaller; Images are large and cropped for transport. Lite Image Server provides image caching and playback.
A client talking to a server allows the server to anticipate and push information in certain situations. Lite has a different mechanism so that the screen received by the client and only some changes can be sent by the server as a variation of the existing screen instead of the full screen, saving data. For example, if they pull a refresh in a news thread and the only change is something like a count of some stories, this difference will only be sent to the client. Alternatively, if a new comment arrives for a story, the server can update the client with the new comment via the diff mechanism without the client even requesting the data.
We set a goal to do well on the lowest-end devices available in emerging markets. A 2009 class device like the Samsung Galaxy Y has a very limited 290 MB of RAM, a 600 MHz processor and 180 MB of internal memory. Our data also showed that supporting ginger would be beneficial. The client architecture ensures reduced CPU, storage and RAM usage on the client. Resource-specific functions such as screen layout are performed by the Lite server; Animations and other heavy UI interactions are avoided. Cache sizes for images and resources are chosen to stay within ten MB. And the client architecture takes steps to keep memory usage low and free up memory when in the background.
Facebook Lite App Launches In The Philippines And India
These design choices help Facebook Lite achieve better performance metrics such as connection, startup time, pull to refresh and image load time on intermittently low network connections.
At Facebook Lite, our goal is to provide the best Facebook experience for everyone, regardless of their device or connection. And by sharing how we built the app, we hope we can inspire more people to build it for the next billion people on the Internet.
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We use cookies to personalize content, tailor and measure ads, and provide a safer experience. By clicking or browsing the site, you agree to allow Facebook and our Facebook information through cookies. Learn more about the controls available, including: Cookie policy There are some countries where you may not always have a fast, consistent or reliable internet connection. With this idea in mind, Facebook released a new Android application, called Facebook Lite, which is a lighter version of the original Facebook application. The app is designed for users on slow and unreliable 2G internet connections.
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Facebook Lite was recently released in two Asian countries, the Philippines and India. The program was tested by the company in January.
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