Yes they are stupid, distracting and some social media firm's "I will get you 10,000 followers" game. But they can help you build your REAL Twitter base of relationships.
Twitter has a 2,000 follower cap - until you build up a ratio of people following you. Just leave the spam. After you build your base past the 2,000 caveat - block them and report them.
I do NOT suggest following them back.
Yeah yeah yeah. And I like raindrops and roses and whiskers on kittens.