Just a point of clarity, as I understand it, a “link farm” is a single page that has a ton of links on it. As kwblue mentioned, everyone has a different idea on how many links per page is good vs. bad. I’ve seen everywhere from 50-100+ links on one page being bad. Many stick to the 10 per page method, I happen to go with 30 per page figuring to be staying well under the 50 threshold.