(There's an interesting question!)

1. QL (obviously...but I have to say i've been guilty of reading more than posting...very educational for media expats!)

2. YOUTUBE

3. Myspace

4. Facebook (yes i gave in...)

Wouldn't really call myself a cyber-community-obsessed person (i like real-life coffee dates too much ha!) but perhaps being part of 4-online communities does qualify part-geek status ...?