Manual Action Penalty- Unnatural links from my site

[mediamonster]

One of blogs have got this manual action penalty. It says that unnatural links are extended from my site. It is a simple blog of mine and I haven't selling links then why Google is applying my site this penalty. I had been writing most of posts. And they didn't have any links in them unless they are utmost necessary and also most of them are no-follow.

[motionz]

You said that you are posting most of your articles but not all of them. right? Then may be it is for the guest posts which have been made in your blog. If the posts are of low quality then the links from them are considered as spammy ones.