I have posted blog comments at blog posts that are more than 6 months old but you say not to do so. Is there a google prohibition on that or just not good form. Most of the time I don't bother to try to post a comment unless there is recent activity - within the last 2-4 weeks. Other wise the comment is discarded.
I guess my question is should I not post on a blog post over 6 months old and why?