I loved the title of Louis Gray's blog title so much I thought I'd nick it it's a tribute really.
On the face of it, it looks like a match made in heaven. The additional search functionality that Friendfeed has (no surprise - it's run by ex-Googlers) - if integrated into Facebook - will make it a very powerful player in the search market and with the Microhoo deal last week it looks like the search market really has hotted up with Facebook definitely now a potential threat to Google search.
There is some disagreement over it's ultimate impact on Twitter, with some suggesting it's a Twitter killer, while others point out that Twitter turned a deal with Friendfeed down some time ago and that it can't compete as single-mindedly as the microblogging service and is therefore simply a vanity purchase on the part of Facebook.
I'm not sure any service is about to kill any other service, however Google and Twitter's total pre-eminence in their respective categories may well be over.