I do understand the purpose of Facebook because it brings people together and allows users to update their "friends" on current life events, photos/videos, anything interesting on the internet, etc - it seems like a "one stop shop" for everything! I am just confused as to how other social media sites became so popular? For example, Instagram. How did this become so popular when this feature was already available with Facebook. Twitter and Tumblr allow posts just like Facebook, so what is the difference between all of these sites and Facebook and what is the purpose of having an account with each site?
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