What are Link farms?
ink farms are pages that consist solely of links to other pages but fail to offer any kind of useful content themselves. Site owners typically place their links on farms to artificially boost linking popularity and thus rankings on sites like Google. Some link farms are automatically generated, while site owners manage others as a repository of reciprocal links.
Due to constant changes and improvements in the google algorithm, having your link in a link farm can be dangerous. You have a probability of getting banned/blacklisted by google for having too many links in such link farms under the pretext of link spamming.