I was joining this other site, and "Sei" was too short, so I was thinking, thinking... thinking... And decided to call myself inSein. Puns are cool and stuff. S is capitalized because I'm not insein, or Insein. I'm inSein. People usually call me Sein, though. Noobs call me Insein. It autocorrects to the weirdest of things, though.
Usually inSein is taken by some guy named Hussein, who took the facebook.com/name thing. Seriously, go look at him. He's scary.
So... I usually have been using ab4c12d3 for anything else. Tumblr, Twitter, and a facebook page so it won't get taken elsewhere. But that's more actually me. inSein is just more personal. I guess you could say the other is business.