Individuals are increasingly visible in online spaces. Posting content to social media, browsing websites, and interacting with friends are all acts that render a person visible to other individuals, networks, and corporations. At the same time, these behaviors are being logged, archived, and aggregated in a variety of unexpected and emerging ways. In this panel, we explore the tensions that arise around controlling personal information online. We do so through a series of case studies around lesbian, gay, bisexual, and transgender (LGBT) identities, children, personal data exchange, and advertising. In each, we consider the politics of visibility around personal, family, social, and community identities, especially in the context of marginalized or scrutinized populations and experiences. We aim to generate debate about appropriate sharing behaviors online and to further an agenda that prioritizes greater control of personal information online.