Security analysts say the huge data dump may include the account details of more than 30 million users of AshleyMadison.com and its companion site EstablishedMen.com
Threats to release some 37 million users' photographs and data come at a time when Ashley Madison's leaders have been discussing a potential $200 million stock offering.
In the wake of cheating scandals at Syracuse University and the University of North Carolina, new allegations have emerged of academic misconduct by basketball players at the University of Texas.
Race officials say Kendall Schler faked her win at last Sunday's GO! St. Louis race. They say she also cheated in last year's race where she finished third.