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There are few applications which provide earnings opportunity but more than that FB is quite good in advertising our own business. So using it we can advertise our business thing and can get good response. By this way surely you can increase your earning.
Facebook is good social networking site indeed but it has oppurtunities to earn through posting Ads and also some affilated programs. I also found a site from facebook which can be used to earn money but one should have skills like writing,editing etc. see the link
Facebook is a good social networking site provided it is used in moderation. For people who are into business can use it to their benefit but it involves cumbersome advertising methods and also the fact that it gathers people's personal data and use it to their advantage does not make it a really viable option of earning money!
I see FB as a marketing more than anything. Facebook can never be a timepass for me, as I am busy with loads of other things. However, I am always associated with FB, increase my friends there as more friends mean more chances to market the articles. This means more revenue :)
Facebook is not a very good platform to earn money. But you can promote your product,web,blog,forum to earn money from the same. If you are marketing consultant then it is ok to go with facebook to complete your campaign. It's all about pure business nothing else