Clear Facebook Cache - Post and Share --developers tip
By jason on 08/05/2013
Sharing facebook content seems easy, and for the most part it is. If you're developing a web asset that is going to be shared on facebook, you want to take advantage of the open graph - and insert facebook open graph meta tags on your page, so you can specify the proper title, thumbnail, url, description, etc: http://davidwalsh.name/facebook-meta-tags - which is used when sharing url via facebook.