Facebook has long clustered feed posts by type: friending people, changing profile pics, playing games, etc. Here are two examples of Facebook clustering feed posts by content... which is a bigger & more important concept as it suggests a deeper focus on search and relevance (both on and off Facebook.com). Both examples happen to be around iPhone related posts - one is on Facebook.com's web browser and the other is on the iPad's browser. Notice how it merges content from friends and pages. And obviously some of the content is highly targeted (ie the MyPad and Lifehacker posts are entirely about iPhone apps). Some is not: Pixie Lott mentions the iPhone - but it is not the focus.
In some ways it looks like a topical newsfeed sorted by recency. Imagine this extending to a topical hubs and a deeper search platform / concept.