Riddle! Prize: Cyber cookie!!!

This is my sisters homework..well not homework really just something for fun. What do you get when you cross a witch and a ...

what is double , half this number 100000000000000000000000000000000000 ?

''Click the 2nd of the first where 3 are the same''

Hey, on youtube or someething, how do you get like, Cyber famous. Like WAY a lot of viewers and stuff?

Three frogs sat on a log, one decided to jump off. How many frogs are on the log?

when I am young I walk on all 4s..when I mature I walk on 2..when I get old im on 3 what am I?

I begin with e and end with e I contain one letter and it is not e. What am I?

just wondering...who has seen harry potter and the half blood prince, and liked the guy that played sixteen year old tom ridd...

It lies behind a curtain,it's small but yet sees the whole world and if the curtain are closed then it won't let you see too....

I'm just really bored ;p Does anyone know any good sights with riddles on them?