Wave Racer.
Business: s1mpled3@gmail.com
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Also, even if it's not the majority, 1/4 new followers actively disliking something that happens when they're brand new still just seems... ill-advised to me. First impressions matter. I'll admit this one has a lot more nuance though.
It does on the other foot additionally give incentive for some people to follow as well. I also don't think, but purely an opinion, most people who dislike it will unfollow because of it because the same people would not have followed in favor of the alert.
Yeah, honestly this one is hard to know what's best. It needs a full-on scientific study. 
I do know that I've done with and without follower alerts many times over the last 7 years and they undoubtedly make a difference. I recently reenabled them and the numbers reflected immediately. Impossible to say it actually impacts growth though in terms of viewership.
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