This is probably related to the recent uptick of failure notices I've been seeing from Twitter:

For some time, we've limited the number of accounts that a single person can follow in a day to 1000. A few days ago, we found that this limit was not being consistently applied and we started enforcing it for all users.

That's almost 42 per hour, so it's not a real limit for real people. It'll be interesting to see who raises a stink about it; maybe it's a "premium account" sort of thing Twitter could charge for :)

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