View the site by using seo xray firefox tool .
After installation ,right click the site then go to seo xray to determine the no follow do follow sites.

you can see the HTML source.

View source will show you easy enough. Just look through the comments and its easy to find out.

Hello,

you can find the "nofollow" with many links in anchor tag <a href="" rel="nofollow" ></a>
so those links are useless for site coz. google do not consider these links

I like dofollow.

yep, its best to use sites that use the dofollow attribute as nofollow wont have anyeffect on your page rankings

right, I will be pay attention more to do follow blog now

Doing all those stuffs for just finding the dofollow blogs. Then why not to use the dofollow blog finder, just put your keyword and find all the dofollow blogs.
Free Tool: Dofollow Discoverer! | Linkers Blog

On firefox you can just click right click on the link and click properties and it will tell you its relation.. Its alot easier than looking at page source..