A person or account that uses spammy
methods to accumulate a large number of followers on a social media
site. This practice is common on Twitter
where a user will friend thousands of strangers with the hope that a percentage will follow back. Many of the follow-backs come from those also hoping to accumulate followers, thus like attracts like and grows similar to how lint is used to remove lint from a dryer lint screen.
I have a thousand followers on Twitter, but about a third of them are lint balls so they don't really count.