28 Days Later
- UK urban exploration forum.
- http://www.28dayslater.co.uk/

Urban Exploration Front
- A community for sharing links, sources and photographs.
- http://community.livejournal.com/explorer/

MySpace: Urbanus Rimor
- Group for sharing information, trading photos and generally getting info about disused and derelict buildings that you've either explored and are interested in exploring.
- http://groups.myspace.com/urbanusrimor

MySpace: Ghost Geeks
- Level-headed, serious ghost geekettes with limited equiptment but eager minds, sensitive natures. Urban exploration, everything from sunken hotels to ghost towns.
- http://groups.myspace.com/ggeeks

Tribe: Abandoned Places
- Anyone interested in abandoned places and urban exploration. Share your pictures, find other expolorers.
- http://tribes.tribe.net/abandonedplaces

Live Journal: Urban Decay
- A community for people who find beauty in decay. Share pictures of abandoned buildings, historical places, things that are falling apart.
- http://community.livejournal.com/urban_decay/

Live Journal: Abandoned Places
- A community dedicated entirely for those of us fascinated with everything abandoned.
- http://community.livejournal.com/abandonedplaces/

Yahoo Groups: Urban Exploration
- Discussing adventure in places you're not supposed to be.
- http://groups.yahoo.com/group/Urban_Exploration/

Yahoo Groups: Modern Ruins
- A forum for photographers of modern ruins. Discussion and shared photographs.
- http://groups.yahoo.com/group/modernruins-photo/

MySpace: Abandoned Muse
- Dedicated to exploring the art of urban decay.
- http://groups.myspace.com/abandonedmuse

MySpace: Urban Explorers International
- For the discussion of urban exploration, architecture, psychogeography, urbanism, city planning, the psychology of place, discovery of places you're not supposed to go.
- http://groups.myspace.com/uei

City Skip
- A group for those interested in urban exploration, urban planning, architecture or cities in general.
- http://groups.myspace.com/cityskip

SU: Urban Explorers
- StumbleUpon group for everybody who enjoys abandoned and derelict places, worldwide. Includes restoration and preservation sites. Share photos, impressions, and memories.
- http://urban-explorers.group.stumbleupon.com/