This document summarizes several popular social media platforms: Facebook has over 2.5 billion users worldwide and owns Instagram and WhatsApp; YouTube has 2.1 billion monthly active users and is used by students for studies; Instagram is a photo and video sharing app with over 2.35 billion active users that originated from "Instant photo and Telegram"; Twitter is a microblogging site with 396.5 million global users that shares images, videos, and thoughts; Telegram is an encrypted messaging app with over 100 million active users; WhatsApp is the world's most popular messaging app with over 2.7 billion monthly users that allows free text, voice, and video messaging between users.