Social media platforms don’t need to replace each other necessarily, Reddit, Twitter, Facebook, and LinkedIn (sigh) all function independent of each other. They have enough user base that they’re sustainable.I can’t imagine WT killing Facebook
Reddit isn’t a social platform, imo. it’s a BBS or forum if you wish. Twitter is some sort of a BBS mixed with instant messaging. Facebook, linkedin, Orkut (a predecessor to google+ ) that didn’t make much success internationally speaking.