Getting your link on Facebook (or other platform) is one thing; getting what you want displayed (title, image, etc) is another thing.
Fortunately Facebook recognizes the
Open Graph Protocol so you can use the OG
Meta Tags to help FB know what you want displayed when someone shares your link
Different social platforms use different markup, naturally. The last link referenced will show you that Twitter has their own thing for this, similar but different.
References:
The Open Graph protocol[
^]
Facebook Developers | PlugIns | Share Button[
^]
The Essential Meta Tags for Social Media | CSS-Tricks[
^]