Twitter List copy
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Twitter List Copy
I just completely overhauled my Twitter lists, a few days after impulsively unfollowing everyone who didn’t follow me back. I deleted many lists and added many users to the ones I kept. I used Twitter List Copy to import all the users on other people’s lists into pre-existing lists of my own.
It uses oAuth so it’s password-free, and despite the disclaimer on the site, it seems to merge imported users with your pre-existing lists just fine. Thanks to Noah Liebman, who built this awesome tool. Follow him on Twitter or check out his website.