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…
Remember its all about balance.
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.
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