When posting to Facebook be sure to use any link you include in the first three lines of your post.
If you don’t, your link will likely be buried below and require the reader to click the “See More” option.
A lot of people don’t click the See More option.
A lot of people are looking at Facebook from their mobile devices.
If you make it easier for people to click your link you’ll get more conversion.
It’s also a good idea to use a link shorting and tracking tool, like the Google URL Shortener. https://goo.gl/
Here’s an example of the technique and a screen capture of what you’ll find at the Google URL Shortener.