I have made my blog's comment dofollow by removing "rel nofollow". Now all the comments of my blog is dodollow. Is it good or bad for my blog? If it is not good then I will make the comments nofollow again! Why most of blogs comments are nofollow? Please suggest me on this point? Thanks
You have to weight the pros and cons. The pro is that you are rewarding your commenters and you might get more traffic and more comments. The big con is that this exposes you to a lot more risk. With that many dofollow links on your site, it is very tough to keep track of whether they are all still in Google's good books. If any of those sites gets hacked or does anything spammy, it can come back to you. Plus all of those dofollow links may limit how much internal PR gets spread around to your other internal links. Then there is the potential to end up on spammer lists where you start getting blasted by spam comments, including junk from automated software. Personally I don't think it's worth the risk and hassles. Perhaps use a top commentators plugin instead for a similar effect but more controllable spam levels and less long term risk.
If you are actively moderating your blog then you can allow dofollow links as you would be getting content via comments and the number of commentators would increase day by day so having dofollow enabled on your site, you are rewarding commentators who contribute to your blog.
If you remain your blog comment Do follow many spammer and seo company do comment in your blog and if you change your comment type no follow from do follow only real person read your post and comment in your blog so you do not face any type of spamming problem .
If you regulary and carefully moderate all your blog comments then dofollow is not a problem and you will get high traffic on your blog but still for your blog safety nofollow comment is a better option.