FB Liker is exactly what you'd expect from an app with that name: an app that helps you get Likes on Facebook automatically. All you have to do is sign in with your account, select the Facebook post you want people to like, and wait. In just a few seconds, the Likes will start rolling in.
To use FB Liker correctly, you MUST take a few things into account. First of all, your profile has to be set to public. Secondly, the post that you want to get Likes for has to be public. If one of these requirements isn't met, then the process will be unsuccessful.
FB Liker is a pretty unusual app that can help you receive tons of Likes from people who don't even really like your posts.