Sylvain from Montréal here, been looking/poking/hacking/monetizing the Twitter API since it opened up (wow, it's been a while).
I am the CTO/co-founder of Needium (http://needium.com) we harvest/index/filter the Twitter API to find people expressing local needs and help small businesses answer them (think: craving sushi and having the closest chef answer your request).
We are a team of 5 developers (mostly Ruby/Rails/Redis and more) working with the API. I also organize many events for developers/hackers at Notman House, a local hacker space (http://notman.org).
I have been blogging at http://afroginthevalley.com for over 10 years and you can find me on Twitter at http://twitter.com/froginthevalley (in English) and http://twitter.com/sylvaincarle (in French).
When I am not obsessing over what people are talking on Twitter in specific cities, you can find me biking the heck out of hills in Montreal (and thinking I could do more or less the same in SF) and teaching my 3 kids longboarding OR fishing OR DJing OR hacking OR camping OR just letting it go (503, try later, implement error handling code for your life events).