This work is about the social dynamics observed at the onset and during the evolution of a financial bubble. Our characterization detects demographic trends in the flux of new investors buying the Nokia asset, i.e. the most representative dotcom stock of the Nordic Stock Exchange during the dotcom bubble. We track the flux of new investors entering the market daily, and we yearly compare their demographic features with those of the whole Finnish population. As for many innovation product or services, we detect a bursty dynamics of access to the market by new investors. We investigate the attributes of age, postal code and gender, of new Nokia investors.