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Here's what's being talked about in pop culture — all following up on David Letterman's announcement that he will retire next year:

• Let the rampant speculation of a successor commence! [Vulture]

• Los Angeles Mayor Eric Garcetti is urging CBS to move "The Late Show" to Los Angeles — which would make up for the city losing "The Tonight Show" to New York when Jimmy Fallon took over. [The Hollywood Reporter]

• Arsenio Hall wins the award for perfect response to Letterman's announcement: ""Man, they are dropping like flies! First Jay, now Daveā€¦ My plan is working perfectly!" [Entertainment Weekly]