My advice, which is the common answer, is to find quality posts, read & understand them and leave comments that show you actually read the posts and that add to the dialog. You'll get rewards and followers that way. People who leave spammy shit comments either get ignored or the posters get fed up and flag them into oblivion. It's a workable system. Also, at a little over 2 months in, I've still got at least 45 SP delegated in my wallet. I'm not sure exactly how that delegated SP gets calculated though.