I am sending a few hundred to twitter a day, but get nearly nothing in return. But I see it as service to my partners and visitors - and I get some free fresh content... ;)
PS: additions to my previous list:
x) mobile friendly
x) you can create an account and maintain your own favorite list
x) country-based column- If you are coming -for example- from germany, spain or netherlands, you get sites from those countries or in their language on top
(Or you just select in on top)
