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Hi Spare, glad you liked the suggestion. And it's great to see you so on the ball, replying to posts everywhere:)
My suggestion is, however, very different from what you are describing. My idea springs from forgetfulness and all I want to know is "Am I supposed to know you? Have we met?"
The Best Answer system gives me the hives - sends me right back to school days. And it is a problematic system. We had it before (before you joined us, I think?) and (as others have pointed out before me) on countless occasions you would see OPs reward replies that rubbed them up the right way and ignoring those that didn't, regardless of how much effort and factual correctness was invested in the latter.
Another thing - that has also been mentinoned here by others before me - is the "problem" of new, excellent replies being added at a later date. You see that on Yahoo Answers a lot and it's hardly helpful, quite the contrary.
Somebody asked for thumbs up like on Facebook. Now that's kind of neat. Everybody - not just the OP - could do the thumbs up to any number of replies on a thread:)) Their own thread or somebody else's. That would be nice, I'd love that.
Question for you Spare: How would one actually use the Who's Online feature? Would it lead to a live chat room? Or a PM option? Possible problem: Lots of ABers stay logged in while they go to the North Pole and back:) Still, PMs would be great.
4getmenot: I'm sorry to hear it. We miss her.