It looks like Facebook is as tired of spam and Like/Share baiting as it's users are. Actually Facebook has done several surveys over the past few years and found out quite a bit about what users like and dislike about the news feed and now Facebook is responding.
If you user the multi-billion user website for any purposes, from simple browsing or for business purposes, you've surely come across many posts that generally don't site comfortably with you. These posts usually come in the form of displaying deceptive titles and descriptions, to forcing the user to perform an action like liking, sharing a webpage or the post, or commenting on them.
They're also going to clean up how they display re-posted content. Their research proved that users aren't too fond of seeing the same posts over and over again. They've tweaked their news feed algorithm to show re-posted much content and found positive results in the form of a 10% decrease in page/post hiding. This points to users being more satisfied while on the site. Remember user satisfaction is one of their primary objectives.
You can read the full announcement by Facebook here.
Are you continually being tricked into clicking on posts and taken to a webpage full of ads? Well if you are, Facebook's fixing this problem too. Without tons of feedback, I'll suggest this isn't the most difficult problem to detect, but Facebook is fractioning in the number of times people Like certain content vs other content and making a determination based on this data.
If more people were motivated to report such posts rather than ignore them, Facebook would have a better understanding of the signs of this kind of content but expecting people to police their news feed on a relevant enough basis isn't what Facebook wants for it's users.
Rest assured that Facebook is on the job and doing it's best to ensure our experience on the website is a good one - in the same way Google and other search engines believe is a matter of great importance. If users get tired enough of the spam, they'll eventually go somewhere else - or go outside!
My suggestion is that if you encounter a post that you know is deceptive to any degree, or forces you to Like, comment or share the content before you can view it, that you report it. Even if you do so once a day you can send better reporting data to Facebook and further help them fight spam. The more we report these posts the better our experience on the site will be. From a business perspective, we don't want Facebook users going elsewhere do we? Probably not.