How Facebook Is Different from Other Social Sites
Lots of social sites besides Facebook try to help people connect. Some popular sites are Twitter, LinkedIn, Google+, Instagram, Tumblr, and many others. Here is the biggest reason Facebook is different. Literally, the biggest: Facebook has over one billion users across the world (yes, billion with a b). Other social sites might be popular in one country or another, but Facebook is popular pretty much everywhere.
You’ll see a lot of similar functionality across different sites: establishing connections, creating Timelines, liking content, and so on. However, each site brings a slightly different emphasis in terms of what is important.
LinkedIn, for example, helps people with career networking, so it puts emphasis on professional information and connections. Match.com, on the other hand, is about matchmaking, so it’s not exactly meant for those who aren’t looking to get a date. Twitter encourages its members to share short tweets, 140-character posts with their connections; and Instagram (which is owned by Facebook) encourages its members to share cool photos taken with mobile phones.
You might find some or all of these sites useful at different points in time, but Facebook wants to be the one that is always useful in one way or another — so it tries to offer an all-encompassing functionality.