It is not easy, I have joined a site named 'bebo' and have a handfull of so called 'friends' in my network. Mostly from my old congregation, they seem to acknowledge my existence, but keep there distance. NO one ever invites me to anything or to hang out.
Get off the computer (Yeah, I know. Look who's talking.) and get out of the house. Join some kind of group. I think what you're missing is group affiliation.