Seems that facebook is getting nothing but glowing reviews.
Ilike is the most successful application on facebook with millions of users signing up. But take a look at their alexa chart and you will see they lost 70% of the traffic to their website since launching on facebook.
I think at the end of the day facebook will reduce independent websites like Ilike, lastfm etc to just another feature that won’t exist outside of a social network. Just like every other business who have a legal obligation to make money, Facebook will have no choice but to clone the most successful applications and build them directly into their platform.