Someone on Twitter who picks people at random to follow, in hopes of boosting their own numbers
Your man Steve is such a "Random Follower" look at him following another 1,000 people that he has no interest in what they say or do. He is trying to boost his numbers.
Someone who just goes along with whatevereveryone else is doing and doesn't think for themselves very much.
A crowd follower will typically see every popular new movie, vote for whoever the "cool" politician is and go along with whatever current pop culture says is in without actually putting much critical thought or research into it.
A marketing initiative on social media to encourage people to follow other users. It is not a bad thing since it can increase your follower count and if you're on Instagram, but on Twitter, these are sent out as a form of inconvenience since it allows every tagged person to blast the others tagged with every reply, like, and retweet the tweet gets. This is especially true if the user doesn't know any of the other users tagged and can be a nuisance if the number of users tagged is large.
Chris: Dude, Angie needs to stop adding me to these Follow Fridays on Twitter. I don't even know who half these users are and I always have to deal with the bullcrap of them blowing up my timeline and notification inbox with GIFs.
Kyle: I know man, they're annoying. Remember the time she tagged both of us in the same Follow Friday? At least you can say "bye" and mute the conversation before anyone starts talking dirty or whatever.
Sydney: She tagged me this morning. I blocked her so that I don't have to deal with this again.