Here’s a tool which helps put the social back into social network. whotweetedme.com allows you to paste in a link, and it’ll come up with a list of people who tweeted or shared that link.
It can work for specific URLs or generic domains – I tried the main homepage URL for this blog and it came up with the list above.
Why so social? Simple – it makes it very easy to thank those people who’ve retweeted you, listing people in order of influence (for influence, read number of followers).
Seriously though, it’s also a useful way to see the people/brands who are sharing your stuff – perhaps making them the people to start building strong relationships on Twitter.