If you use Twitter you’ve probably come across TrueTwit. When you add users you sometimes get a DM from the user (actually it’s sent by TrueTwit) asking you to validate yourself by typing out a captcha. If you sign up you will get some tools to manage your users.
The biggest worry with True Twit is that it send DMs to users who try to follow me. That’s not good. Some users resent it a lot. It’s a kind of spamming - sending unsolicited DMs. If you don’t want to send the DMs and still be able to manage your users you need to sign up for thier service.
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