true_INFP - 7:43 am on Oct 10, 2010 (gmt 0)
I should add that I wrote about Facebook, not Twitter.
If they merely requested the limited right to distribute your unmodified logo via their sites, we'd have no problem with that (obviously, that would be the reason why we'd upload it to their server).
Seriously, if any of you already uploaded your trademarked logo to Facebook, you gave them (and their chosen sub-licensees) permission to exercise any copyright and trademark rights you have in the logo (and any other intellectual property rights therein).
(Unless Google and Microsoft have special private agreements with them, Facebook can now use the Google and Microsoft logos for anything they want and in any way they want. And they can permit any of their sub-licensees to do the same...)