Web Site promotion through search engine Optimization SEO & positioning is an important part of a strong online presence
Link Farm & Disadvantages, How to Beware of Link Farms.
Link Farms : Link Farms and their drawbacks ?
Link farm consists of sites that link to other sites for the sole purpose of increasing their link popularity score. Unlike perfectly valid links to sites with related information, sites that participate in link farming contain links to totally unrelated sites. This practice is also referred to as Link Stuffing.
Google hates link farms and labels the links they generate as spam. In fact, Google gates them so much that some sites get removed from the index if they're affiliated with link farms. Spooked, some webmasters are considering removing all outbound links from their sites.
That's an overreaction that decreases the site value to visitors and hurts the Web in general because cross-linking is a basic tenet of the Internet. Links are fine - even encouraged - if they are related to your topic, but link farms rarely provide useful content to visitors.
If your site is devoted to your favorite rock band and you include links to the band members' personal sites, other fan sites, and links to stores that sell the band's music, that's not a link farm. You're providing access to other sites that will probably interest your visitors.
But if you signed up with a service that promises to generate two hundred inbound links to your site only if you agree to add two hundred outbound links in return, then you've planted a link farm. Instead of linking to related information of value to your visitors, you're instead sending them to sites about herbal supplements, children's clothes, pet rats, and other totally unrelated (possibly X-rated) topics.