1. One address per computer is allowed. Using multiple addresses from same computer will lead all balances to zero.
2. Direct earning has a limit of 20000 Satoshi per payment cycle. Beyond this all direct earning will go to Ad Balance.
3. Referral earning has no limit.
4. Ad Balance is to be spent by advertising on CoinLearn.org. Users get premium advertising opportunity at the bottom of the CoinLearn.org home page.