Bluelight is a web-forum, research portal, online community, and non-profit organization dedicated to harm reduction in drug use.

[1][2] Its userbase includes current and former substance users, academic researchers, drug policy activists, and mental health advocates.

[34] The site began to explode in popularity in the early 2000s with the rise of MDMA in the club scene, amassing nearly 7,000 members by the year 2000 and 59,000 by the start of 2006.

[32] The centerpiece of this expansion is a Discord community dedicated to harm reduction, mental health, & peer support.

[33] The community brands itself as "a safe haven for people who are LGBTQIA+, neurodivergent, substance users, struggling with mental health, or just don't feel like they fit in anywhere else.