From what I can gather, there were a bunch of people who were able to claim auroracoins through the airdrop using SMS/Facebook based on various forums and social media outlets. In that sense the airdrop was successful. But who knows how many of the airdrops were legitimate. For all we know, most of the airdrop might have gone to the creators of the coins so they could cash out. I haven't seen any evidence against this.
Any airdrop that is targeted towards a local population is going to be difficult and costly to pull off because there is no way to easily verify people's identity. Furthermore, how can you verify that the coin's creators aren't claiming the airdrop to themselves? In my opinion, the creator of these coins are using "airdrops" to build up hype and don't really have any practical way of handling the airdrop. Or worse, they fully intend to claim most of the coins themselves and sell it off before it crashes. In a sense , it's an age old pump and dump scheme applied in the alt coin arena.
I am very interested in this too. Maybe you should have a look at stellar (they doing it bound to facebook users and they are at least somehow successful). I made a proposal for a pure "airdrop"/ basic income currency here: https://forum.ethereum.org/discussion/1598/basic-income-circles-reputation-market-based-approach-to-solve-the-identity-problem-sybil-attacs#latest
– user599464 – 2014-11-25T21:54:21.570@user599464 Well, Facebook authentication is only so reliable. I was also thinking about some basic income currency in regards to this. – ThePiachu – 2014-11-25T22:41:48.403