Basing my comments solely on what I have read (and not on actual experience), I think there is a huge difference: real-time geography updates.
If, on the random chance that I am in the downtown LA area (a rarity for me) with a unexpected time on my hands, I can instantly look to see who is in that area (based on GPS). Then, I can contact that specific person(s) to see if they want to hook up.
With Twitter, I have to post to say I am in the area and then wait to see if someone 1) happens to see the message, and 2) hope they are in the same area.
Brightkite has a definite advantage here.
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The thing about quotes on the internet is that you cannot verify their validity.- Abraham Lincoln
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