I honestly wouldn't flag anybody's blog post, unless it was an abusive scam -- and even then, I'd have to be certain that it wasn't a scam.

I have the opinion that if I don't like something, but it's not abusive or hurting anyone physically or financially -- basically, if it's just someone expressing their opinion on their own blog -- I'll just ignore it.

However, if someone persists in copy/pasting the same follow begging post on my blog, I'll probably warn them and then flag it if they don't listen, and probably mute the user if they demonstrate that they aren't going to change.

I have so many people making authentic comments on my blog that it isn't fair to waste time on people who are abusing the community.