From the real time search service’s blog post:
Until today, we’ve been indexing the links shared on Twitter, MySpace, Digg, Delicious and by our own OneRiot panel to help determine our search results. Now, with the addition of Facebook data, OneRiot delivers search results that reflect the pulse of a much, much wider social web.
Also, the service seems a bit wary of what might come of all this:
Now, of course, we’re only showing (indeed, only have access to) data that has been shared publicly by Facebook users. A user can restrict the visibility of these Likes on their Facebook profile. However, we’d be sidestepping the issue if we didn’t recognize that some users might be concerned that stuff they have shared on Facebook can now pop up on services like ours. Given that, we are rolling out this feature as a very limited bucket test today to assess users’ reactions and gather feedback. We love the new feature. And if users do too then we’ll roll it out to everyone at an appropriate speed.
As well they should. The service can be found here.