There are many sites available to earn money but its not enough to live a happy life. The only way I tried to earn online money is the signature campaign and it's just a tiny amount, and unfortunately not passive, you can't sit back and see some money money coming every month, so unfortunately we have to stick to a job and then consider online money as a alternate source of income.
signature campaign only small earning if you compare with "real job sallary"
some people in real life get salary ~1btc/month, if you join Bit-X and you can make a good posting maybe you can make a living online