We've contracted a traditional SEO firm, mostly for link building. As part of their plan they want to submit our site to a large list of link directories, and we're not sure if that's a good option. As far as we know, those directories have been ineffective for a long time now, and we're wondering if there is the chance of getting penalized by google. When I asked the agency their opinion about that, they gave me the following answer - Updated and optimized by us - We are partnered with these sites and control quality of these sites. Unique Class C IP address - Links from unique Referring Class C IP plays a very important role in SEO. Powered by high PR backlinks Domain Authority (DA) Score of over 20 These directories are well categorized. So they actually control those directories themselves, which we think is even worse. I'm wondering what does the Moz community think about link directory submission - is there still something to be gained there, is there any risk involved, etc. Thanks!