I have a blog that I’ve had a few years now, but lately the comments has been declining. A friend of mine mentioned comments on my blog could be spam links and potentially lower my google rankings. Not only that, but they could have viruses. On a website it mentioned to delete links with HTML in it. I was wondering about links that have php in them, or gaming sites. I am a little confused as to how to determine which is a spam link or ones that are ligit? Does anyone have suggestions?