I agree there's too much spam going on, but that doesn't worry me. First, I routinely take a look at my followers list and check for new ones. I look at their blog and see if they're posting any original content, not just linking youtube or urls to other articles. And I choose the promising ones. I also look at new posts, trending, hot ones and again. select who I can follow. Plus, the feeds/resteems I get help me discover new authors who share my interests, and slowly I'm building on that. I think it's the way to filter spammers from good authors. In time, the spammers will get fed up because nobody will support them.