First booking has
3000+ UA miles by May 29th 2015.
Kaligo is a hotel search engine from Singapore that earns miles with United, American Airlines, BA, .., etc. It has selections from more than 300,000 hotels.
(Rule 1)Your friends get
1,000 extra miles on top of the current Kaligo offer when using your link to register a new account.
(Rule 2)You get 1,000 miles every time one of your friends makes their first booking with Kaligo.
Please consider use this link:
UA
https://www.kaligo.com/unitedairlines/1V7ZPTID
They also has a 5-day flash promotion by May 29th 2015 using the registered email address.
All bookings >=
2,000 bonus miles
Some references: (I am not new member. If you are new member, it should be 3000+)
They also have cashback from Singapore.
http://mycashback.sg/kaligo