It could be that SG is like a nude beach. Anonymity allows you to bare all and play, unfettered by 'real-world' concerns. Then you run into someone you know and -- SCREEEECH! -- the music stops as the needle goes sliding off the record. Suddenly the nude beach is a naked beach and you're sitting there in the real world making awkward chat with a towel covering your suddenly private bits.
scylla:
Hell yeah! Intersections of reality & constructs all over the place!