Not necessary. It all, very much, depends on the site owner's configuration, if it allows a "DoFollow" on the link tag.
I'm do you mean NoFollow? I'm not familiar with DoFollow. with NoFollow, as far as i know, it wont be counted. Why not have an SEO Consultant for that?
Yeah! But I would suggest that you focus to comments on do follow blogs that are related to your niche. The big G doesn't count no follow links.
I'm do you mean NoFollow? I'm not familiar with DoFollow. with NoFollow, as far as i know, it wont be counted. Why not have an SEO Consultant for that?
Nope, its not like that, Google considers few of them and its randomly selects the best relevant links for your website.
yes, It is very usefull to comment on dofollow blog. If dofollow blog has higher pr than it is more beneficial for you.