PARIS, FRANCE: Vivendi will acquire 8.5% stake in the digital communication group Progressif Media from ZeWatchers. Progressif Media specializes among other things, in the design and execution of social network campaigns. ZeWatchers will own 30%, and the three founders, Emile Duport, David Bonhomme and Thomas Ghys, who retain 60% of the company. Vivendi will acquire…