It's kinda strange this mentality we have with Internet stuff, we put so much out there thinking its anon when really, its not...so many people on BB I have on FB now or have interacted with via my business, so many I would love to meet IRL.
If someone came up to me and said "oh wow youre starry sky! " I think I'd be a bit chuffed, but then afterwards would be thinking oh ****! lol
I probably would approach someone if I thought I recognised them from here, or PM them to let them know I know who they are, put the ball in their court so to speak...guess it all depends on the circumstance...