There is a general conception that NoFollow links are rubbish, so you have to wonder; is there any value in accumulating them?
The theory is NoFollow backlinks do not get indexed, this is perhaps true for a percentage of the sites out there but from experience, I can confirm that NoFollow links do indeed get indexed.
So for what reason does this happen? Well, it’s all about site authority and link relevance. Large amounts of NoFollow links do get indexed but they get indexed because of the content on that site. Despite the fact they are unlikely to increase your backlink count, there is a popular belief that suggests they will increase your PageRank. However, for the simple reason that the link is indexed and is therefore displayed in the SERP’s, they will ultimately bring in traffic!
50% of the battle is the relevance of the link. In order to get NoFollow links indexed they must comprise keyword rich relevant information. It’s important not to spam your keyword! Responding to questions on high PR Forums is a good example, if you answer a question making sure you include your keyword in the answer. The question and the result (your answer and backlink) will then appear on the indexed page, meaning that it will get indexed and it will get listed even though it’s not going to increase your backlink score.
The other 50 percent of the battle is authority, Look for authority websites with lots of visitors and lots of indexed pages, google especially will index and list both the question and your answer and with it, a link to your website. (No backlink just indexed).
So the question is, are NoFollow links useless? Not at all, you should make NoFollow linking an integral part of your ‘traffic creation’ exploits. However, you have got to make sure you find the correct sites to get your links from. Remember RELEVANCE & AUTHORITY.