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In the study, observers rated the [Facebook] profiles of people they did not know. These ratings were then compared to the profile owners’ actual personality and their ideal-personality. Personality impressions based on online social network profiles were accurate and were not affected by profile owners’ self-idealization.

Accuracy was strongest for extraversion — paralleling results of face-to-face encounters — and lowest for neuroticism. Those findings were consistent with previous research showing that neuroticism is difficult to detect without being in person