I've never 100% understood why these social networks were so integrated. It's normal to me now, but years ago the concept of facebook.com/twitter and twitter.co

I've never 100% understood why these social networks were so integrated. It's normal to me now, but years ago the concept of facebook.com/twitter and twitter.com/facebook would scramble the business side of my mind. Especially when I think back to how solid of a line was drawn between Myspace and Facebook