"An airdrop for a cryptocurrency is a procedure of distributing tokens by awarding them to existing holders of a particular blockchain currency, such as Bitcoin or Ethereum. In the United States, the practice has raised questions about tax liabilities and whether they amount to income or capital gains." - Wikipedia
Here are some other good resources:
- https://steemit.com/free/@pokernomad/what-is-a-cryptocurrency-airdrop
- http://cryptomining-blog.com/tag/airdrop/ (AuroraCoin)
- https://bestbitcoinalternative.com/resources/cryptocurrency-airdrop/
- https://www.ethnews.com/cryptocurrency-airdrops
- https://www.quora.com/What-is-a-cryptocurrency-airdrop
Statistics from www.coinmarketcap.com:
Jan 31 2018 00:02:00 UTC
$502,853,000 USD: Total Market Capitalization
$25,147,800,000 USD: 24-Hour Volume
33.84%: Bitcoin Dominance