Youtube has many celebrities in it.
For example :
1. Smosh
2. Pewdiepie
3. Ray William Johnson
4. IJustine
And many more!

My favorite is smosh, pewdiepie, thefinebros, epicmealtime
How about yours? Let me and the englsih sf users know!

Advice : you should watch pewdiepie and epicmealtime
For me pewdiepie makes me laugh really hard
And epicmealtime makes me hungry real bad