Currently I am doing some bounty campaigns to earn some coins from the project that I am participated. I am not participating in airdrops anymore I think it is wasting my time. Nor of the airdrops that I have joined giving me reward so I decided to leave those methods. Doing bounty campaigns like signature campaign, twitter, facebook, it is a simple way to earn altcoins.
Agreed. This is not only the easiest, but also a reliable way to earn money. Here you can be sure that you will get at least something in contrast to the same airdrop.