Again Facebook makes changes to their algorithm EdgeRank, the algorithm is to decide the extent to which the updates are displayed on Facebook. That is, every time we publish something on our wall, how many people see it.
The solution is very easy, using a specific tag such as
Additionally, there are more tags to be used in Facebook, we can detail other parameters when we share a link such as the image that appears with the link, title, etc.
A common problem is that despite these metatags have been incorporated into your website, you can continue seeing the ancient description. That means that your page is in the cache of facebook and you have to delete it. Simply go to Facebook debugger and introduce your website, it will remove the cache of Facebook and publish information containing your metatags.