Like Me? Follow Me.
For those of you who can't read it and don't want to enlarge the image, that link has a rel="dofollow" attribute attached to it.
Here's the thing - there's no such thing as a "dofollow" attribute.
The search engines created the "nofollow" attribute so webmasters could indicate links to which they did not want to pass PageRank/link authority - for example, advertisers, sites they were talking about negatively, etc. You don't need a "dofollow" because any link that doesn't have a "nofollow" attribute is by default going to be followed - it'll count.
What makes this comment so darn funny (if you hadn't already grasped the irony) is that the people trying to use the "dofollow" are also trying to rank for "SEO" - so they should know better. The fact that they don't (and that they're using comment spam on an SEO blog to try and rank for "SEO") suggests they aren't very good at SEO and so probably haven't a hope in h*** of actually competing for that search term. In fact, they could probably use a little SEO training themselves.