Previously ASKING people on your Facebook Ad to "click Like" or just 'Click' was acceptable. New Faceboo policies will still allow this however you might be penalised if the bounce rate to your ad is high, in other words if you ask people to click on your ad and when they do they do not stay on the clicked destination for long, Facebook will assume that your site or page clicked to has little or no interest to the viewer and you will get penalised. Here is what say exacty ......
"Today we’re announcing some improvements to News Feed to help people find the posts and links from publishers that are most interesting and relevant, and to continue to weed out stories that people frequently tell us are spammy and that they don’t want to see. We’re making two updates, the first to reduce click-baiting headlines, and the second to help people see links shared on Facebook in the best format.
“Click-baiting” is when a publisher posts a link with a headline that encourages people to click to see more, without telling them much information about what they will see. Posts like these tend to get a lot of clicks, which means that these posts get shown to more people, and get shown higher up in News Feed."
However, when we asked people in an initial survey what type of content they preferred to see in their News Feeds, 80% of the time people preferred headlines that helped them decide if they wanted to read the full article before they had to click through.
Over time, stories with “click-bait” headlines can drown out content from friends and Pages that people really care about."
Facebook also go on to explain how they determine what looks like click-bait.....
"One way is to look at how long people spend reading an article away from Facebook. If people click on an article and spend time reading it, it suggests they clicked through to something valuable. If they click through to a link and then come straight back to Facebook, it suggests that they didn’t find something that they wanted. With this update we will start taking into account whether people tend to spend time away from Facebook after clicking a link, or whether they tend to come straight back to News Feed when we rank stories with links in them.
Another factor we will use to try and show fewer of these types of stories is to look at the ratio of people clicking on the content compared to people discussing and sharing it with their friends. If a lot of people click on the link, but relatively few people click Like, or comment on the story when they return to Facebook, this also suggests that people didn’t click through to something that was valuable to them."