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WhatsApp (officially WhatsApp Messenger) is an instant messaging (IM) and voice-over-IP (VoIP) service owned by technology conglomerate Meta. [13] It allows users to send text, voice messages and video messages, [14] make voice and video calls, and share images, documents, user locations, and other content.
Using a tailing architecture, events are stored in log files, and the logs are tailed. The system rolls these events up and writes them to storage. The user interface then pulls the data out and displays it to users. Facebook handles requests as AJAX behavior. These requests are written to a log file using Scribe (developed by Facebook). [37]
[53] [54] The optional paid subscription gives users increased limits in the app, such as larger file uploads, faster download speeds, unlimited voice message transcription, [157] as well as numerous other increases such as the number of pinned chats and folders. Premium users have access to extra stickers, emoji, reactions, and customization ...