There are a few things that would result from making your blog a dofollow blog. The first thing that you will notice is that you will receive a lot more spam from real people in your comments section. These people use software to find all dofollow blogs and links and then spam these websites to improve their own or client’s rankings. You should only allow dofollow links if you are willing to check each comment and link to make sure that they are relevant and not spam.

Another side effect of allowing dofollow links is that your ranking with Google will fall. The reason for this is because you can be penalized by Google if you allow bad links or spam links in the comments section of your website. If you do not keep track of the links being posted on your blog then you blog’s Pagerank can fall drastically and you can expect to get a lot less search traffic.

It is important to note that dofollow can be a great idea but you need to be able to check each link left on your blog to make sure that they do not negatively affect your ranking with Google. If you cannot do this, which would be the case if you just have too many comments being posted on a daily basis, then it is recommended that you have a nofollow blog. This will help to protect your Pageranking and search as well, which is very important to webmasters and bloggers.