Social networking wasn’t something you would tend to rate a whole city’s intellectual quotient on, but what gives. This Tweet-O-Meter Wall measures tweeting activity in nine major cities. This wall can be found at British Library’s Center for Advanced Spatial Analysis. It seems to be a pretty smart way to analyze time zones of cities as well, irrespective of its indirectness.

The main purpose of the wall was to study the ‘social dynamics among Twitter users around the world. Was there an age when they did the same for pigeons?
Gearfuse