Due to people reporting this as spam and twitter suspending our API access we have had to remove the ability to post these from our application. You can still use this tool to collect the users to #ff, you will just have to copy the tweets from here and post it on your own twitter account. Sorry for the inconvience.
Give your retweeters and those that mention you a #followfriday shoutout!
Sign in with twitter and you will see those that mention and retweet you ready for a shoutout.
If you have a ton of them we can't get them all, but we can make it easy for the ones we can :)