I think the reason for this is that the base of users that Twitter took time to build up used Twitter to spread the word that Friendfeed was better in many respects. So a large chunk of Twitter users moved to Friendfeed in a short period of time. - Devin Anderson via fftogo
I've also been running a daily tweetscan of "friendfeed" for about 2-3 months and have seen many, many tweets of people talking about getting on friendfeed. - Devin Anderson via fftogo