(unknown): Major/Minor public universities in U.S.
Why: Every year there are new students entering and exiting schooling all the time. Most college students have credit cards and willing to spend if its "exciting." Every year is another year of exposure to new students. Business around and near college campus tend to caterer to the college students more often than not. If college kids start buying bitcoins, local business have to take notice and could start a small bitcoin economy around campuses. The Bitcoin ATMs must be flashy and Web 2.0 themed when presented.