I no longer go after airdrop bounties 80% are always not real and some carry phishing links,so i have put them aside just focus on my normal bounties as in signature,Facebook,twitter and blogs.
The phishing links are actually the issue with airdrops , otherwise they are about the easiest way to acquire coins. I had one link recently but I have not really taken it up because of the risk of phishing sites. You can't be really sure of knowing a phishing free site.