Can Blog Comments with Links Back To You Harm Your Site Ranking?
No, unless Google thinks there is a pattern sufficiently obvious to suggest you are using this as a’Link Building Strategy’.
What is ‘Link Building Strategy’?
Which is just as well since if you’re good at what you do, and lots of people link to you, it would be pretty unfair if your site was harmed because of that. Googles Matt Cutts has covered this and what good practices are and are not.
If you employ people to build links this way or attempt to do so yourself, you may be in danger of getting punished. However, you CAN link to your own page provided it doesn’t look like an aggressive link building strategy, or as Cutts puts it:
“The sorts of things that I would start to worry about is it’s better to often leave your name so someone knows who they are dealing with, rather than “cheap study tutorials” or “fake driver’s license”, or whatever the name of your business is, often that will get a chillier reception than if you show up with your name.
…..If your primary link building strategy is to leave comments all over the web, to the degree that you have a huge fraction of your link portfolio comments, and no real people linking to you, then at some point that can be considered a link scheme. At a very high level we reserve the right to take action on any sort of deceptive or manipulative link schemes that we consider to be distorting or rankings.”
But just going about doing the occasional link back to yourself rather that deliberately spending all day creating links back to yourself “you should be completely fine and it’s not the sort of thing you should be worried about it all.”
If you hire bloggers to write about you that can also be fine especially as long as they are professionals that have recognised ‘authorship authority’ on Google, and build appropriate links to you from the site they are on, write in ways relevant to the site they are on, and is relevant to you via the link.