There is numerous coins that do airdrops right now or some that promise some coins against some actions (likes & tweets for example).
It is a very clever way to promote a new coin, sometimes without an ICO at all, sometimes to put some awareness on a coin before an ICO. In all cases it could be a good way to earn free money.
A lot of them have referral programs so if you invite some friends you can get more coins.
Here is a list of current airdrops & campaigns:
- DeepOnion: my favourite but you have to met specific conditions, https://bitcointalk.org/index.php?topic=2006010.0
- eBTC: https://www.ebtc.io/
- BitBase: https://www.bitbase.io/?rb=2848. $5 value.
- PoSToken (POS): https://airdrop.postoken.org/?r=2fdcu34b. You need an account registered on bitcointalk.org before August 22, 2017. A lot of other bonuses (twitter, facebook, signature, referral...)
- Sphere (SAT): https://sphere.social/?ref_code=5309-a0a011e8. $10 value.
- WCX: https://wcex.co/?ref=F6Zbs6cC. $5 value.
- Geens: https://geens.com/user/register?id=In3BDxqE. You have to like their facebook or twitter.
And ones that will be announced soon:
- EthereumDARK (ETHD): https://bitcointalk.org/index.php?topic=2106405.0 - Airdrop #2 is over. #3 & #4 to come.
- Funnel: https://bitcointalk.org/index.php?topic=2200378.0 - Airdrop #3 will begin when thread read view reaches 10,000
And an original one, you have to play to win tokens: https://bitcointalk.org/index.php?topic=2206107.0