As per reverse engineering expert Jane Manchun Wong recent tweet, Facebook is testing with different color highlighting for links and hashtags in their post text. As you can see in the below image of Wong's tweet, the tag and hashtag are highlighted in Facebook blue.Doesn't it sound interesting?
Check out the link for more information: https://bit.ly/2Tcz6Xx
https://i.imgur.com/C2ey2t1.jpg
in Sri Lanka