-- Aegis Media: Mainardo de Nardis has stepped down from his role as CEO and will be succeeded by Jerry Buhlmann, who also joins the board June 2. Buhlmann has been CEO of Aegis Media EMEA since 2003, and was CEO of Carat International from 2000 to 2003. The shakeup comes just weeks after David Verklin stepped down from his post as CEO Aegis Media Americas and Sarah Fay, CEO of both Carat and Aegis’ Isobar US, was tapped to replace him. More at our sister site PC:UK.

-- Facebook: Just as it gears up to spend some major dough on infrastructure, Facebook has lost its CTO Adam D’Angelo, reports Kara at All Things D. What prompted him to leave isn’t totally clear although there’s the continuing chatter about tension in the top ranks. Officially, D’Angelo, 23 and a long-time friend of Mark Zuckerberg, just wanted to move on. This is the second major departure this year, following the loss of chief revenue officer (and erstwhile COO) Owen Van Natta.

-- MTVN: Michael Bloom has defected back to MTV after having moved to RealNetworks’ (NSDQ: RNWK) Rhapsody America to run the joint venture between MTV and Rhapsody last September. No word yet on his title, but an MTV spokesman tells Alley Insider Bloom will have a “leadership position.” Other MTV execs who recently left Rhapsody include Marc Ache, who left his post as VP-technology to return to MTV as SVP-digital technology group and Doug Ferguson, who served as VP-product strategy.

-- Tribune Co.: Mark Shapiro, president and CEO of Six Flags Inc., has been added to Tribune Co.’s board of directors; his lengthy experience at ESPN (NYSE: DIS) is likely to be just as valuable as his since-gained roller-coaster expertise. Gary Weitman was promoted to SVP-corporate communications from VP-corporate communications. Release.

• Industry Moves: Verklin To Step Down As CEO of Aegis Media Americas; May Head Project Canoe : Report