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This service is now closed. The following is for historical interest only.
Using the Firefox web browser? Consider installing the Greasemonkey add-on - then you can install the Twitter Blacklist Greasemonkey script which displays a banner on blacklisted Twitter accounts!
If you prefer not to do that, you can always use our username checker to see if any particular username has been added to the Twitter Blacklist. Alternatively, we have a "bookmarklet" that you can use. Simply click and drag this link onto the bookmarks toolbar of your browser: Twitter Blacklist Check.
Be sure to also check out @carlo's Twerp Scan tool! It scans your followers list for people to show you anyone following over 1000 people, or over a certain ratio. Better still, it lets you block them directly. It's well worth a try!
We have an API that you can use to query the Twitter Blacklist; also all blacklistings are announced (via Twitter, natch) as twitblacklisted, so you can get an RSS feed there to play with.