TC50 Backstage: Why Dick Costolo Joined Twitter and the Magic Acquisition Number

It’s 5 p.m. and we’re in the homestretch! The experts and the Twitterers seem to be less impressed with the companies this afternoon than the ones this morning. That or we’re all just getting tired after 40-something demos.

So lucky for us that some of the most influential and interesting judges were left for the final panel. I caught up with one of my favorites, Dick Costolo, who most people know as the new COO of Twitter, others know as the former co-founder of Feedburner and far fewers know as a former improv comedian.

Costolo and I talked about why he gave up a plush post-acquisition Chicago life to move to Silicon Valley and run the day-to-day Twitter operations, when it’s a good idea to hire your friends and when it isn’t, Twitter’s magic acquisition number, and why startup M&A is like teenage crushes.

Also, Twitter CEO Evan Williams has been outspoken about not enjoying his time at Google after the Blogger acquisition. Others have cited that as a reason Twitter may not sell to Google in the future. I asked Costolo whether he had the same experience.

Video is on the jump.