Facebook made several important announcements on Wednesday. I'll leave the details to others--this is a music-focused blog, after all--but I think that Facebook's leaders have positioned it as the infrastructure provider of the emerging social Web and potentially as the first Internet company to challenge Google's dominance in online advertising.

Basically, now that everybody (400 million users) is on Facebook, the company is trying to extend itself to the rest of the Web, allowing you to broadcast your likes and dislikes from other sites back to your Facebook friends, and allowing your Facebook social graph to extend beyond the confines of the site. (Robert Scoble has a good roundup of the implications.)

More: http://news.cnet.com/8301-13526_3-20003210-27.html