Twitter has something worse than spam, it's auto-follow marketers.
You post about anything and some keyword triggers some bot to auto-follow your account and now your followers list is full of useless garbage, not people genuinely interested in having a discussion.
The other day I tweeted about the pregnant lady that got stuck in our elevator and couldn't call for help because she doesn't carry her cell phone so she won't "irradiate the baby" and the next thing you know I'm being followed by a bunch of twitter accounts for people selling baby stuff and cell phones!
I was mildly disappointed that no elevator service followed me.
Just a recent example but it happens daily and I just block them.
Surely I can't be the only one that auto-follow bots are driving insane.