I found my show! #GraceandFrankie💖 on a bender! Jane & Lily are so bad a$$!
-- Miley Ray Cyrus (@MileyCyrus) May 25, 2015
Except not really. As fun as it would be to believe that Miley Cyrus' Twitter was single-handedly responsible for bringing Grace and Frankie back, it probably was not. Every Netflix original series has been picked up for a second season, even the extremely bloated, terrible ones that no one watches, largely because the initial investment on making the show is substantial enough that there's no reason not to give it another few episodes to build an audience. (Particularly when Netflix isn't dependent on the immediacy of Nielsen ratings.) You'll also notice that Kauffman thanks Ted Sarandos, Netflix's Chief Content Officer (and the man largely responsible for the fourth season of Arrested Development) before Miley.
Sorry to spoil the fun, but there is another possible benefit to connecting Miley with Grace and Frankie -- maybe she'll get to act on the show's second season?