How much is too much time on social media?  The average Facebook user spends almost an hour on the site each day. It’s the dominant platform in Australia, according to a study published earlier this year by Sensis, which also found almost eight in 10 Aussies are connected to online networks. And it’s pretty addictive.

According to a Deloitte survey, many smartphone users check their socials in the morning before their feet hit the bedroom floor. Whether that’s all time well spent or flushed away is up for conjecture (and, of course, boils down to the individual user). But the mounting research suggests social media can be a slippery slope.

A must-read study conducted for Harvard Business Review concluded that overdoing it will actually bring you down. “Overall, our results showed that, while real-world social networks were positively associated with overall well-being, the use of Facebook was negatively associated with overall well-being,” researchers note.

And in a stunning conclusion, the results were particularly strong for mental health. Most measures of Facebook use in one year predicted a decrease in mental health at a later time. “We found consistently that both liking others’ content and clicking links significantly predicted a subsequent reduction in self-reported physical health, mental health, and life satisfaction,” the report finds.