https://bitcointalk.org/index.php?topic=3965435 AB have 4 airdrops (which are all payable in AB Tokens):

1. 1000 AB Tokens for sharing Accounting Blockchain's posts on FB (limited to once a week)

2. 2000 AB Tokens for retweeting Accounting Blockchain's official tweets (limited to once a week)

3. 500 AB Tokens when subscribing to the site

4. 2000 AB Tokens when joining the telegram channel