(While I also have a SoFurry and VCL account, I am not particularly active on either of these.)
Other Sites - Otterface posts on some sites on my behalf. He is active on:
e621 - as user 'otterface'
herpy - as user 'FriskyFerals'
That's it. I am NOT active on Facebook, nor associated with anyone presently on Facebook who may claim to be associated with me, or claim to be me.
I usually only go by the alias 'Sefeiren', or in the single case of tumblr; 'Seffosaurus'.
I don't visit any fandom related forums, and I do not keep an open Instant Messenger. If you happen to be talking to someone who says they're 'Sefeiren' in either of these places, odds are it's not me.
I primarily work off of Furaffinity when it comes to commission work, so please exercise caution when dealing with anyone outside of the aforementioned sites when purchasing something from someone using my alias. I'd rather people not get scammed by individuals pretending to be me.