VlogBrothers (sometimes stylised as Vlogbrothers) is a video blog, or "vlog" style channel on YouTube. The Internet-based show is created and hosted by the Green brothers: John Green and Hank Green. The first incarnation of the brothers' online broadcasting was the "Brotherhood 2.0" project, preceding the establishment of the pair's regular vlogging activity through the VlogBrothers channel.
The VlogBrothers channel was the first in what would become a larger portfolio of YouTube channels created and developed by the Greens, sparking a community of fans and supporters of VlogBrothers, known individually as Nerdfighters, and collectively as Nerdfighteria. Subscribers of the brothers on YouTube are the base of the online community Nerdfighteria. The Green brothers encourage their viewers to become a community by creating websites and various projects, like the Project for Awesome, as a way to engage with their subscribers.
The Greens state that their vlog has no consistent format: "Really, it's not about anything in particular. Whether we're talking about our lives, making each other laugh, or trying to get something more important across, people seem to enjoy it." The channel passed one million subscribers on March 5, 2013. As of 2016, the brothers post two videos per week onto their VlogBrothers channel. John Green posts a video on Tuesday, and Hank Green on Friday.