Now, this mistake is really a popular one! When hunting for backlinks, you should concentrate on relevant sites only. If you have a dating site, getting links from a finance one is not valuable. It is true that it is not easy to find relevant sites to get links from but unless your site is in a very narrow niche, chances are that there are hundreds or even thousands of relevant sites you can get a backlink from. If you need a list of such sites for your niche, try the Backlink Builder and see what suggestions it can give you.