Found an interesting quote in an article in The Times Online (UK):
Social networkers go to MySpace and Facebook to chat with friends, not to champion brands. But, they do chat about the things they are most passionate about, and often that means brands, cool brands.
There is a very subtle but extremely important difference: we talk about brands in the course of a conversation but we don’t have a conversation about brands.
Products and brands come up in the flow of conversation - this is normal. But when was the last time you sat with a buddy to talk about the latest iPod? People are passionate about products - technology, music, cars, makeup, etc., and people talk about these things with their friends. However, if a “friend” (Facebook superficial acquaintance?) of mine kept pushing his product - that was the conversation - he would not be a friend much longer.
Marketers need to figure this out, and Facebook’s new system isn’t helping.