I'm on facebook but I rarely update my "status", I use it mainly to see what my friends are up to, and occasionally comment on their activities.
I think I would be more likely to post up random vintage bike related pics and comments there than here, as I said earlier, they don't all warrant starting whole threads about them, but they may garner a few comments. Every time I post an old climbing pic on my facebook wall I get a few comments.
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1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"