During a lively Q2 earnings call (live blog), Zynga (ZNGA) partly attributed its poor results/guidance to changes made to Facebook's app discovery platform that favor newer games. Those changes led to a 34% Y/Y drop in users for live games. Zynga was also quick to blame $210M acquisition Draw Something, and is hoping online gambling (international markets launch in 1H13) will give it a lift. CEO Mark Pincus is drawing heat for selling $200M in stock in March. ZNGA -37.8%. FB -8%.