Facebook investors have accused director Marc Andreessen of secretly coaching CEO Mark Zuckerberg regarding a major sale of shares he held. The structure of the sale enabled Zuckerberg to refocus on philanthropic activities while maintaining lifetime control over the company he cofounded. The suit alleges that Andreessen, Zuckerberg’s long-time mentor, secretly tipped off the CEO about concerns raised by other members of Facebook’s board while Zuckerberg was in the process of getting the company shares reclassified so he could maintain control.