It's easy for a portion of people on HN to minimize their use of Facebook because most visitors to this site hate ads and have a general dislike and distrust towards the service Facebook offers. On the contrary, the general population doesn't have the same perspective on things since they aren't as technical and probably less educated as many HN visitors so they'll continue to use Facebook disregarding the potential consequences that may arise. Also it doesn't help a lot of people are still using Facebook and still remains a great way to keep up with people.
