I usually use the same nickname for all service with maybe with a number suffix Usually "1", so... is easy find me.

Twitter: http://twitter.com/sifiro

AnimeList: http://www.anime-planet.com/users/sifiro

Steam: http://steamcommunity.com/id/sifiro/

BattleTag: Sifiro#2510

Discord: Sifiro#7000 (So easy, Right?)

PSN: sifiro153