Could it eventually make it's way to Google or Yahoo? Then, could it harm our rankings?
Webrep asks a single thing....Do You
Like This Site. "Like", that is all.
Well, there is also "type of content" that you can vote on, but thats not the part you are worrying after, you are worried about people "seeing red", so to speak.
But back to the point, "Like" is by its nature,
extremely subjective. The problem is, no one takes time to see what WebRep really means, they assume that because it is bundled with a security product that it is only concerned with security.
I don't know how search results are prioritized, so I don't know how or if this would affect that. I know it wont land you on a blacklist or anything, if that is what you are worried about.
Avast! has never disclosed the exact WebRep measurements system, largely to prevent what concerns you, poisoning of results.