Let’s face it, spam is the very definition of Twitter, but most types of Twitter spam can be combatted. The majority of spamming ploys carry significant risk for the spammer, and are easily penalised, directly, by the recipient. For instance, you can unfollow someone who spams you with Direct Messages. Or you can report a spam tweet, which can, if enough other users do likewise, see the perpetrator’s account suspended. You can even Mute users whose tweets are annoying and/or of no value.
But List spam is different. It slips under the radar, evading penalty, and Continue reading List Spammers: Twitter’s Great Unpunishables