GMC Profile: http://gmc.yoyogames.com/index.php?showuser=73119
YoYo Games Profile: http://sandbox.yoyogames.com/users/Exar
DeviantArt Profile: http://exarmaster.deviantart.com/
GameJolt Profile: http://gamejolt.com/profile/exartech/411/
GMArcade Profile: http://gmarcade.com/user/2214.html (is it still active anymore?)
Old Website (emphasis on old): http://exartech.webs.com/
There are probably more, but I've lost track of them all.
Note that if you manage to get in through with me through any of these, you must be very lucky.
I think I check these semi-annually, on an am-I-bored basis.