They can improve traffic, and dofollow links are better.

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Both are very good way to get quality back links..I use both and i am getting very good results for my site..

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whose want to search trusted game online , choice our agency

why , i cannot make a new post/reply?

forum is the best for good white hate SEO Backlink

blog and forum good, but I think forum is better for web site ranking

forum site is best for web site ranking

Forums are the discussion sites
and blog is communing site :D

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Wow .... you are asking about forum in forum !! marvellous

for only web site ranking u can buy it?

Yes, I agree with you...

Blogs and Forums are two different techniques in seo we are posting a blogs in particular products, topic,or items and forums is the way to give the answering to different-different threads

I would say that the primary difference between a group blog and a forum is the fact that a blog can often stand alone, with no comments, and still be valuable content. Usually, a forum topic is made more valuable by the discussion that responds to it. Of course, the same can be true for a blog post, but not as often.
A second important difference is that a group blog generally focuses around a specific niche, whereas a forum can be subdivided into several subject areas that may be more diverse.