Never participate in online sweep stakes.
Because it is not fair to believe that we can lead our life in the mercy of our fortune.
Life is mixed with fortune and misfortune..
So do some what creative.
If you wish to earn money online there are many ways.
Google AdSense and affiliate marketing are some of them.
But most of them need your involvement.
They are not passive income streams.
And if you are interested to join in online form filling/ad posting work there are many web sites.
To join such a web site for free send a mail to email@example.com with a subject line "moneyjobsy".
They will send you all the information for free.