This is the story of Beenz.com (now defunct). From its wikipedia article:
beenz.com was a website that allowed consumers to earn beenz, a type of online currency, for performing activities such as visiting a web site, shopping online, or logging on through an Internet service provider. The beenz e-currency could then be spent with participating online merchants.
Wikipedia also lists Michael Saylor as an investor (without citation):
The marketing and brand concept positioned Beenz as "universal, incentive-based currency for on-line merchants… a globally acceptable alternative to money that would influence and reward on-line consumer behavior". The Beenz management team raised almost $100 million from venture capitalists including Apax Patricof, Larry Ellison of Oracle, Michael Saylor of Microstrategy, François Pinault of PPR, Vivendi Universal, Italian financier Carlo de Benedetti and Hikari Tsushin of Japan.