Can Facebook help you open up a new possibility of an additional income stream?

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I noted in my Facebook's list of friends that some were actually business entities taking advantage of facebook's reputation as the most popular social networking site as a mean of target marketing. I read countless claims in the internet that Facebook had indeed boost their sales and increased revenue. However, as a beginner in the business world, a person who is looking for an additional income stream to supplement his day job salary, what could be the other options that could be ventured into Facebook apart from the already popular Blogging Adsense revenue? Your response would be really appreciated. Thank you.