well the longer the better. Make it a useful and informative comment. Add to the conversation. Make sure you don't just spam with your link there...add value and try to help people.
main criteria of blog commenting is blog should not be a spam, with that you have to keep it mind about the blog content, it should be unique also and informative, helpful content.
There's no criteria, really. For me it's all a matter of common sense: 1. Do not SPAM 2. Make your comments relevant to the post and informative/helpful If you are going to participate in a blog/forum, make sure you make your comments helpful by giving value to the readers. Don't just comment for the sake of the backlinks. Your site's name is on your signature along with your name. Site owners are more likely to approve your comments and users are more likely to click on your links if they know you're sincerely trying to help. Hope that helps. Have a good day!
The best particles with blog commenting will mainly _ Over spamming _ Posting commenting like Thanks, Great article , etc we can comment on any of the blog or site, but the comment must encourage the discussion * simply the comment must be use full for other searcher who are really looking for the information . If you really doing like this you will really enjoy the blogging with good amount of traffic!
Well blog commenting a ways for link blinding, the best way for blog commenting is that the comment should be relevant to the post ,don't spam , and don't be irrelevant..