Below a quick classification of some link types and their quality in the post penguin-panda world. Having excessive thin directory links even if from trusted sites could damage your “trust”.
So, for example – having excessive thin directory links even if from local or industry niche specific sites CAN hurt you if you don’t have other relevant high quality backlinks. Take a quick look at the chart below, but don’t assume links are safe just because they are in the safe zones…
[pullquote align=”left”]Remember its all about balance. [/pullquote]
If you mess up and build links with your money keywords only, it won’t matter how good your backlinks are because you’ll caught by the Google filters leading to a Penguin slap.