Social media includes various online platforms like blogs, micro-blogging sites, virtual worlds, podcasts, social networks, wikis, and content communities. YouTube is a popular content community that receives over 100 million views daily and allows easy sharing of user-uploaded videos. Facebook is a large global social network that connects millions of people worldwide through profiles and networks organized by location and interests. Wikipedia is a free online encyclopedia where anyone can edit and contribute to its many collaborative articles to ensure current information.