Is there any point on link building posting a comments?

I receive too many spams comments on my site with their links of course. Is there any way I could minimize or totally stop these comments?

 

use <a rel="nofollow"></a>,
for bigger effect you can inform your users about this change on your website

 

Sometimes you get spam comments even with the "nofollow" .Find some plugins to solve the problem..

 

After 3 days of your post being active, close off comments for it.

 

What about Akismet?

 

there are two ways to do.

* adding nofollow to every external link
* to approve every comment

 

I have turned off commenting on my blogs because of this problem.

 

If your using wordpress then just use the askimet plugin. The only positive to having a link in the comments is for actual traffic from the site.

 

comments and suggestions are highly appreciated

Thanks a lot people.