You can vote here for some of the awards. Voting goes until April 25 and the winners will be announced on April 30. The actual ceremony takes place May 21.
Some nomination highlights, full list of nominees here:
Best Mobile Media Streaming
Best Individual Performance
Comedians in Cars Getting Coffee
Jean Dujardins's Villain Auditions
Charlize Theron Gets Hacked
Lena Dunham for Obama for America "First Time"
Social: Best Education and Discovery
National Geographic Education
Nasas Curiosity Mars Rover
The New Public Library
Best Mobile User Experience
Cool Hunting Gift Guide
Google Maps for iPhone
Best Social Media Campaign