I'm on Skype at night, and Gchat/GTalk/G+chat all the time, although I
don't use it much. A note: 99% of the time I'm invisible, so send me a
message and if I answer... well, that means I'm there!
I check Twitter more than anything else, so the best way to reach/ping me
if I don't seem to be there is @passcod.
I also hang about Mozilla's IRC, #js and #webdev mostly, and #jetpack these
days as I'm building something with the Addon SDK.
I do have a Facebook profile, but I don't use it much, so trying that will
probably not be helpful.