Twitter API: Offers access to tweets, user profiles, trends, and more. You can search for specific keywords, monitor hashtags, or pull a user's tweet history. Facebook Graph API: Used to access public data from Facebook pages, posts, and comments. It can also provide data from groups, events, and other entities. Instagram API: Now part of the Facebook Graph API, it allows access to Instagram posts, stories, comments, and user profiles (depending on permission). YouTube Data API: Allows access to video metadata, comments, channel statistics, and more.