EDIT: Please note. this list is misleading and incorrect Websites do NOT have PR, pages do : Mittineague
Increasing backlinks is one of the crucial tasks for any website or blog. No doubt, higher the number of backlinks for your blog, more is the love from Google. If there are good reputed websites linking you, you can increase your Google Page Rank very easily.
I am providing here the list of 27 DoFollow Social Bookmarking sites. Submit your posts to these sites and increase your page rank.
These are not link building sites. These are social network sites. If you want to increase back links you must need to go forums, directories, blog commenting or article submission directories.
there is no such link building site in the whole world
Any site which is pointing back at your site is considered as a backlink by google
Do follow comes first and no follow comes after it
but again, a link is a link and the more links you can make the more good its gonna be for your sites rank in search engine pages
In terms of SEO, nofollow links are of no importance at all. Search engines will ignore them completely. They might be useful in attracting some direct traffic, but that’s a different question.
2 : I agree with you but, why would be build link from sites that are not good ?
Because it’s usually easier! Websites in bad neighbourhoods are generally there because they give links away to every Tom, Dick and Hermione who wants one, so it’s going to be easy to get them to give you a link as well. And when people say/believe things like “a link is a link and the more links you can make the more good its gonna be for your sites rank in search engine pages”, the implication is that they think that all links are equal, when that just isn’t true.
A dofollow or nofollow link cannot be weighted like this. This statement is absolutely ridiculous.
There are two prospective you can view your links :
No. 1. In terms of Traffic :
Dofollow or Nofollw does not matter, if you get a good amount of traffic from any of them it is better than the other. No. 2. In terms of SEO
Dofollow links provide you a share of the linking page’s PR. Nofollow links provide you no incentives.
Please note that all your links should contain content relevant to your site, if you link haphazardly it hampers you more as SE devalue your site if you are in a bad neighborhood.