Facebook Chief Operating Officer Sheryl Sandberg issued a deft non-apology for Facebook's user experiments:

COO Sheryl Sandberg called the experiment "poorly timed" and went on to apologize, reports The Wall Street Journal. "This was part of ongoing research companies do to test different products, and that was what it was; it was poorly communicated," said Sandberg. "And for that communication we apologize. We never meant to upset you."

Somehow, I don't think that's going to do anything to calm the people who are very upset about the experiments.