Facebook Adds Twitter to News Feed

I just noticed a surprising link on my Facebook News Feed. It says, “follow @jasonrobb,” pointing to Jason Robb’s Twitter stream. What’s this? Is Facebook partnering with Twitter? I don’t think this kind of social-media-symbiosis would appear on Facebook’s most popular page without some heavy financial consideration.

A screenshot of my Facebook News Feed, showing a "follow @jasonrobb" link.

Now, I might just be the last to notice this feature. But it seems pretty big to me. Facebook has been positioning itself to compete with Twitter for months now. Why would they link to them from their News Feed?