According to the developer, Chris Lacy[1], Link Bubble was in development before Facebook's Messenger was released.
Ehh. I'm not convinced this point really matters. If you ship a great idea first, you shipped it first.. no?
Re:Link Bubble - A new browser for Android
by TheCraiggers on Monday March 24, 2014 @10:41AM
(#7458447)
>Well, to be fair, Facebook was the company that created the always open "floating bubble" concept, to my knowledge.
I believe Holo in Paranoid Android's ROM was first, beating Facebook's app by a few months at least.
Link Bubble behaves very similarly to Facebook Messenger in this way (the way the bubbles move, how you interact with them, close them, etc), and I can't help but think that Facebook was inspiration for the project.
This is actually a good thing because I always thought that the Chat Heads were a novel idea, though Link Bubble's implementation of the concept is rougher around the edges than Facebook (e.g. "laggier", not quite as clean in design).