Don't do airdrops based on social media accounts! Make airdrop based on holding some other asset at given time
I don't support this, this is just a system of making the rich richer. What about those that don't have money to buy coins how do they now benefit from airdrops?
I commented on a similar thread today so instead of rewriting I will just quote my previous reply
Solution to problem, before any airdrop/bounty (twitter, Facebook etc) participant is been paid, proof of authentication should be performed from the account of participants. (I believe many airdrop/bounty campaigns are already doing this). Secondly the address feature should be utilized. This will reduced the level of the fraud, payment address should be gotten from participants profile and not through Google form. whether it's btc or eth or any other address.
Addition: satoshi and admins of forum foresaw this problem and created a solution long time ago. Bitcointalk has the solution.
How?: All social media accounts used in participation of the supposed airdrop should be linked to your bitcointalk profile. The
Other contact info space can be used to link your Facebook, Twitter, Telegram etc username that way when users try to cheat by creating multiple bitcointalk accounts they'll be cut and ban just as mod are currently banning alt accounts.
Note: reverse airdrop scam can't be eradicated totally but can be reduced.