I have been collecting a crawl starting from one of FriendFeed's founders Bret Taylor's subscriptions. In some of the previous posts, I have shared an initial analysis of this crawl. After the crawl came to a completion, I have found about 70,535 users who are either directly or indirectly connected to Bret. This leads me to believe that the true user population of FriendFeed might be around 75-80,000 range (also similar to the numbers found by crawling the public users). I think FriendFeed is still mostly an early adopter tool and hasn't gone as main stream yet.
Well, if you are curious what your bret number (six degrees of Bret Taylor) is, check out this zoho sheet and search for your name by clicking the Auto Filter.