Hello, I am using Ubuntu since last 1+ year. And It just works. Ubuntu gives lots of new stuff every 6 month , Yes, Ubuntu release newer version  every 6 month.

New Release of Ubuntu Lucid Lynx 10.04 is available for download.
Its having social application capabilities (twitter, chat, digg, facebook etc) in OS itself.
Atleast Try it, and if you like it (I am sure you are gonna like it), than use it.