Facebook is supposed to envelope us in the warm embrace of our social network, and scanning friends’ pages is supposed to make us feel loved, supported and important (at least in the lives of those we like). But skimming through photos of friends’ life successes can trigger feelings of envy, misery and loneliness as well, according to researchers from two German universities. The scientists studied 600 people who logged time on the social network and discovered that one in three felt worse after visiting the site—especially if they viewed vacation photos. Facebook frequenters who spent time on the site without posting their own content were also more likely to feel dissatisfied.

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The most common cause of Facebook frustration came from users comparing themselves socially to their peers, while the second most common source of dissatisfaction was “lack of attention” from having fewer comments, likes and general feedback compared to friends.