- Facebook: Launched in 2004, Facebook became one of the most popular social networking sites. Users could:
- Create a profile, listing their interests and connections
- Share content, such as photos and videos
- Chat with friends using instant messaging
- Participate in online communities
- Twitter: Launched in 2006, Twitter became a popular microblogging platform. Users could:
- Share short messages (tweets) with their followers
- Follow other users and see their tweets
- Participate in online communities, such as hashtags and discussions
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