Senh: This sounds like a short-term thing if Facebook decides to buy Opera because most people will be using smartphones in the long term. Opera Mini is great if you don't have broadband connection (3G or 4G) or if you're using a simple cell phone.
With all the talk focused on Android, iPhone, and lately Windows Phone 7, I’m glad the guys at Opera haven’t forgetten about the group of us who are still using Windows Mobile 6.5 (or earlier versions). Opera released a native version of Opera Mini 5 Beta for Windows Mobile earlier this year, and being a beta release, it was buggy. Sometime in September, they finally got a chance fix those bugs and improve the page rendering.