Who on this Earth doesn’t want to visit magnificent Vienna? That too completely free of cost. Airberlin and Vienna Tourist Board are going to fulfill your wish. Like Airberlin or Vienna Tourist Board Facebook pages to be part of this exciting offer. You and up to five of your friends could spend a long weekend in Vienna, including a flight voucher for a return flight to/from Vienna.
To make things easier, I am giving you the direct link of the competition.
P.S. – I guess this competition is not meant for Indian residents.