There are two main ways they do this:
- All comment links are dofollow
- Comment links are nofollow, but Top Commentators are rewarded with a dofollow link
The Dofollow Search Tool helps you find blogs that have one or both of these mechanisms in place, meaning you get more bang for your…er…comment!
Please don’t spam! Most of these sites moderate all comments anyway, but even if you’re successful initially, the end result will be that you’ll end up on Akismet’s naughty list!