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PayPerPost, the site that pays people to write about certain products and services on their blogs, has launched a Facebook application. For now, its functionality is limited: it lists Marketplace Opportunities, lists the subjects you've written about and (mainly) acts as an affiliate advertisement to put on your Facebook profile and make money when your referrals sign up.
Coupled with the Facebook news feed, however, PPP could potentially become an annoyance on Facebook. You can imagine a scenario in which people could be paid for writing on Facebook blogs, posting certain Facebook apps to their profiles or (worse) filling the News Feed with commercial information like ads. It's a risk that also increases as more Facebook ad networks spring up: hopefully Facebookers will disown friends that use such services. If not, Facebook itself may need guidelines about what constitutes excessive "feed spam".