* Facebook: Yes, mobile is hurting ad revenue
* Ezra Klein: Larry Summers vs. the long-termers
* Perspective: Was Zynga’s deal for OMG POP that disastrous?
* Hubris: Imprisoned swindler Mark Swartz says Tyco owes him money
* Morning Call: U.S. futures point lower, European shares climb and the Nikkei slides.
* Next? Zoe Cruz shutters hedge fund
* Doug Kass: Buy in May and go away
* Derek Thompson: The morality of unpaid internships
* Uptight bank analyst: Zuck’s hoodie a sign of “immaturity”
* Jonathan Bloom: A doctor’s-eye view of Silicon Valley
* Cisco’s Chambers: ‘We sure don’t like enterprise IT spend trend’
* Evelyn Rusli: The Morgan Stanley banker behind most big tech IPOs
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* Tweet of the Day: @brianbeutler A gaffe as trial balloon shall henceforth be known as a gaffoon. #Biden