Event:
Dick Costolo, CEO of Twitter, steps down after the company reports poor first quarter results; cofounder Jack Dorsey will step in as temporary CEO, but Costolo will keep his position on the board
More Notable Events on June 11: 1986 Amnesty International megaconcert
1975 1st oil pumped from North Sea oilfield
1964 Manfred Mann record Do Wah Diddy Diddy
1859 Comstock silver load discovered near Virginia City, Nevada
1770 Captain James Cook discovers Great Barrier Reef off Australia
