What people post on Facebook can provide insight into someone’s mental health, a new study suggests.

Researchers say that the things people post – and even the things they don’t – can provide an indication of their psychological health.

The study, conducted by the University of Missouri, asked 200 students to print out their Facebook activity. The students were also given the option of blacking out portions of their posts they didn’t want to share with the researchers.

What they found is that some of the students showed signs of social anhedonia. If you don’t speak in medical terms, that condition suggests a person has the inability to experience pleasure from usually enjoyable activities.

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