Opera runs on every non-iOS and non-Android smart phone.
For those of us wondering why Facebook would even consider buying Opera, have a look at the worldwide mobile browser usage share.
Blue is Apple, and Red is Google. Orange is Opera, at #3. Hello, Facebook!
(Now you know why people say that Nokia, RIM, and Microsoft are all dead on mobile...)
By the way, Where is mobile Firefox on this chart?
Filed under "Other".
Poor mobile Firefox.
We hardly knew you.