Today at 6 p.m. ET, skateboard legend Tony Hawk will participate in a live online chat during X Games LA 2012. Hawk will be chatting during the Skateboard Street Finals at this year's X Games. Hawk is a pioneer in Skate Vert -- at the 1999 X Games, he became the first skateboarder to land a 900. He's also the founder of the Tony Hawk Foundation, which funds skateparks in low-income areas. Send your questions now and join Hawk here on Sunday at 6 p.m.