He wasn't the only masked movie star, but he was probably the most famous in Mexico.

NPR: The Masked Men of Mexican Movies

That definition excludes people who were significantly famous before they hit the Web, like television and movie star turned top Twitter user Ashton Kutcher, and leaves us with a pool of people whose fame grew out of, and is dependent on, the Internet.

FORBES: Call For Nominations: The Web Celeb 25