I will do your comment posting job, but to get dofollow website is a little difficult, if you don't include hyperlink then there is much chances of grabing lots of dofollow websites, because they don't want any marketing stuff, but at least we can leave a live links in signature line.
Anyhow, if you want links from social networking websites, article submission and forum then It is better to grab many dofollow websites as mostly they are dofollow.
Waiting for your reply, if you find that my bid is not suitable then we can negociate but first of all let me know your requirements.
Pawan Kumar Yadav
Noida (UP)
India