To my experience, Facebook has a rather efficient algorithm that monitors who you show interest in and then populate your feed with what they consider relevant

To my experience, Facebook has a rather efficient algorithm that monitors who you show interest in and then populate your feed with what they consider relevant information. In the case that your feed does get junk, there's a reason why it's presented as a stream, a mixture of both meaningful and useless information that's easy to skim and pick what interests you, same as news sites. You really just look at headlines and click on what you want to read. Continuously browsing a friend's profile that spams your wall will only continue to spam your wall. Hope you get a better experience out of it soon.