The researchers also saw that the depressed students in their study tended to exhibit high "flow duration entropy." They said that "often occurs when there is frequent switching among Internet applications like email, chat rooms and games. This may indicate difficulty concentrating. This finding, too, is consistent with the psychological literature: according to the National Institute of Mental Health, difficulty concentrating is also a sign of depressive symptoms among students."

They also said that higher amounts of video watching, gaming and chatting correlated with depression.

So what's all this really mean?

Anyone who's ever taken a course in statistics knows designing a valid research study -- meaning, one that's not biased, flawed or otherwise illogical in the conclusions it draws -- is tricky; there are innumerable variables that can influence how results shake out, not to mention the inferences researchers draw from them.

So let's get this straight -- high email usage indicates depression? Frequent switching between applications is cause for concern?