I agree with Elkipse. It would just turn into more spamming.
What is the point of liking something anyway, or the +1 anyway? Just to show you support something? It doesn't do anything. Fizzer relies on User Voice, so unless you vote there it won't matter.
If it is not a feature (thus not user voice item), why not actually give your two cents? Say why you support something. People do a +1 and you don't even know what comment they are endorsing anyway. The original comment or the one right above them (sometimes people use ^ to denote that)?