Nerdfighteria is an online community founded by brothers John Green and Hank Green. It emerged from their YouTube channel, Vlogbrothers, where they communicate through video messages. The community is characterized by its members, known as "Nerdfighters," who promote intellectualism, creativity, and social activism. Nerdfighteria encourages its members to support various charitable causes, often through initiatives like Project for Awesome, which raises funds for nonprofits. The community values kindness, education, and the celebration of nerdy interests, fostering a sense of belonging among its diverse members.