The purpose of this study was to explore how Navy active duty service members advance professional knowledge through informal learning using Navy-related social media tools. Two research questions were utilized: a. How do Navy service members advance their professional knowledge through informal learning by interacting with peers within Navy-related social media tools?, b. How do Navy service members advance their professional knowledge through informal learning interacting with digital objects within Navy-related social media tools? Data included ten semi-structured, in-depth interviews and field notes. Data analysis was conducted through general inductive analysis and constant comparison. Findings showed that service members advanced professional knowledge by interacting with their peers through reducing organizational hierarchy barriers, learning vicariously through others, recognizing who has credible information, and translating Navy-speak. Interacting with digital objects encouraged service members to advance professional knowledge through following learning pathways enabled by links, adding incremental additive knowledge through visuals, adopting transmitted culture, and not reinventing the wheel for posts and templates. From the findings, three prominent conclusions were drawn: Social media facilitates many types of informal learning characteristic of VHRD that are critical for service member professional development; A hybrid of Navy culture and the specific social media group's values supports cultural relevancy and flexibility to assist informal learning and developing into VHRD; A media-rich environment enables informal learning through Navy-related social media leading to professional development of self and others outside of the platform through learning transfer.