Vulnerability is based on mutuality and requires boundaries and trust. It's not oversharing, it's not purging, it's not indiscriminate disclosure, and it's not celebrity-style social media information dumps. Vulnerability is about sharing our feelings and our experiences with people who have earned the right to hear them.
Brené Brown (2012). “Daring Greatly: How the Courage to Be Vulnerable Transforms the Way We Live, Love, Parent, and Lead”, p.45, Penguin