Your pop culture cheat sheet

Here's what's happening in the world of entertainment today:

• It's the circle of life on Twitter - just as an online campaign to get "30 Rock's" Tracy Morgan on the social networking site has succeeded, according to The Wall Street Journal, People reports that Miley Cyrus has deleted her Twitter account, citing advice from "Liam," who is believed to be Australian actor Liam Hemsworth. This has launched another campaign, "#mileycomeback."

• EW.com reports that the ABC comedy trio of "Modern Family," "The Middle" and "Cougar Town" have all been picked up for full seasons. All three of these shows have been well received by critics and audiences. "Hank," starring Kelsey Grammer, however, has yet to be picked up. Meanwhile, "Southland," one of NBC's big series for this past mid-season, has been canceled before its second season even began, according to The Hollywood Reporter. Dramas on NBC are something of an endangered species, thanks to "The Jay Leno Show."

• Daniel Radcliffe is trying his hand at musical theater for the first time, according to Variety. The "Harry Potter" star will take the lead in of a possible Broadway revival of "How to Succeed in Business Without Really Trying."

• Book 'em, Dan-o: Variety reports that CBS wants to bring back the classic series "Hawaii Five-O." Writing partners Alex Kurtzman and Roberto Orci ("Star Trek," "Transformers," "Fringe") will team up to resurrect the cop show, which made Jack Lord a star.