E-mail is generally the best way to reach me.
My e-mail address is my first name (Robert) at this site's domain.
I dislike social networking sites, so I don't use most of them. I prefer real life anyways.
I do have a LinkedIn profile, but that's about it.
There is a user with the handle of "rtomsick" on Twitter.
He's not me.
International: Use e-mail. It's cheaper.