here:
http://valleywag.gawker.com/jack-dorsey-screwed-his-friends-...Dorsey often tried to act as if he were in control, posturing that his actions were all part of a bigger plan, but employees saw him frequently pacing in frustration around South Park. He also habitually left around 6 p.m. for drawing classes, hot yoga sessions and a course at a local fashion school. (He wanted to learn to make an A-line skirt and, eventually, jeans.)