Facebook is one of those place which people will use to make some money online but the only way which I see people can make money through facebook is that they will need to go into affiliate marketing,
mostly now that the christmas period have come you can promote cloth and watches affiliate programs on facebook and people will see it love the service you promote and purchase it then you can make commission.
Aside from this I dont know of any good method which that can be done because I dont think facebook pay for socializing