When you set an external link in your blog with the href tag , you can do it with DoFollow or NoFollow with the rel attribute, and both influence in search engines in different ways.
What is DoFollow and NoFollow?
- NoFollow: nofollow is a non-standard HTML attribute value used to instruct search engines that a hyperlink should not influence the link target’s ranking in the search engine’s index. This attribute is added automatically to URLs input into comments, so that those URLs don’t get any link from you.
- DoFollow: technically is nothing, this attribute doesn’t exist but the people call “dofollow” to disable the rel=”nofollow” attribute added to external links.
Which is better?
Neither dofollow nor nofollow are better, you should analyze what do you want for your blog.
NoFollow attribute is intended to reduce the effectiveness of certain types of search engine spam, thereby improving the quality of search engine results and preventing the index of spam from occurring in the first place and to deter spammers from posting comments to boost their URLs search rankings. But according to the statistics shown at the Akismet’s antispam service, this tag has not stopped the comment spam and has not discouraged spammers.
While all engines that support the attribute exclude links that use nofollow attribute from their ranking calculation, the details about the exact interpretation of the attribute vary from search engine to search engine. The following is a table courtesy of wikipedia about the interpretation by the individual search engines:

By removing nofollow attribute, you won’t get more spam than you get daily, akismet is made to block it anyway. Instead, you will be helping to other bloggers who comment on your posts to grown their community by linking them into search engines. You may also start to see more comments in your blog, which it’s better for you.
How to remove NoFollow attribute?
There is a plugin for wordpress to remove this attribute from your comments. Also I found some tutorials to remove this evil attribute from your Blogspot, TypePad or Moveable Type. In addition, there is a button over the web which you can put in your sidebar to let people know that you’ve setup DoFollow, thank Randa Clay for the pretty button.

What do you use, NoFollow Or DoFollow?
This guest post was from Mr Javo, a 19 year old Venezuelan marketer. Visit his site for more tips and advice on Internet marketing.
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Which Should You Use: NoFollow Or DoFollow ?…
A post about thus both attributes, very interesting and important for a blog….
[...] have no idea, but don’t be a spammer!. If you don’t know what’s Dofollow, please check my guest post on [...]