From
http://faucet.bitcoinzebra.com/payment:2016-01-23 IMPORTANT INFORMATION ABOUT THIS WEEKS PAYMENT RUN
On Thursday 21st January we were advised by Google that our AdSense account has been disabled. As you are probably aware AdSense is our highest source of advertising income, and the timing of this means that we will receive no revenue for the AdSense ads shown on Bitcoin Zebra for the whole of December 2015 and so far in January 2106. We are not the only major faucet that that this has happened to - you may have already heard about others that have suffered the same consequences. We have submitted an appeal to Google and we are speaking to our AdSense account manager to try to get to the bottom of why this happened and how it can be resolved.