I always thought of twitter as facebook's natural extension - what happens next in the clash of the titans? Will facebook play catchup on twitter look/feel as a

I always thought of twitter as facebook's natural extension - what happens next in the clash of the titans? Will facebook play catchup on twitter look/feel as a mode like this 'Lite' - and on the other hand will twitter spread out to search chasing google while google chases facebook? Interesting times.