If you're an average joe then you should use whatever you prefer, even though most people I know use Instagram I don't like it and don't use it since I don't take many pictures. On the other hand I love twitter, not a fan of Facebook though I use it because of school where most people like to communicate there.
It's also important to check new stuff out though or you'll be left behind on the technodrome forums with others who refused to change
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