Facebook is going to get a lot more commercial, if you choose it to. Facebook is planning on giving users opportunities to share on their buying experiences, giving companies a greater ability to advertise and have their own facebook page.
Bottom line: It's about generating advertising revenue. Facebook has to find a way for it to make more money.
I'm not sure I like where Facebook is going in this department, and maybe it won't work.
For a more in depth look at what Facebook is doing, check out this Indy Star Article.