On the two-year anniversary of Michael Jackson's death, those most inspired by his life -- music stars and celebrities who knew him -- took to their Twitter pages to remember his legacy. A few famous screen names, like Timbaland, 'Glee' star Darren Criss and Christina Perri poured out their feelings about his passing on the screen, while for some, like Justin Bieber and Katy Perry, a simple 'RIP MJ' got the point across.