I want to follow anyone who liked or retweeted tweets from members of a list. Is this even possible? I've added lists, the posts on those lists are getting a lot of activity, but I'm not following anyone.
add /subscribersat the end of that list's url, and it will work
Doing that will add all users from that list. You will need another filter to just add the ones who retweeted tweets from a members list
@trolling4dollars try it again and open the embedded browser and see what's happening, it should be going through the latest posts until it finds enough users to follow and then starts following them.