If G+ community size is any indicator...
634 - Swords & Wizardry 
551 - Original D&D 
549 - Dungeon Crawl Classics
512 - Advanced D&D 
329 - Lamentations of the Flame Princes 
236 - Adventurer Conqueror King 
222 - Labyrinth Lord 
209 - Castles and Crusades 
208 - Basic Fantasy
143 - Talislanta 
124 - Astonishing Swordsmen & Sorcerers of Hyperborea
119 - Adventures Dark and Deep
115 - Holmes Basic 
110 - Basic / Expert D&D
97   - AD&D 2e 
70   - Delving Deeper
For Reference:
2142 - Pathfinder
1465 - OSR Group 
1430 - Dungeon World 
1195 - Savage Worlds 
733   - D&D Next 
653   - D&D (4e)
437   - GURPS
365   - Shadowrun  
 
 
The Adventures Dark and Deep group has 119...
ReplyDeleteThe OSR community itself seems to have a nice solid 1465, Holmes Basic has 115, Sci Fi OSR has 241, and Vintage Role Playing Games has 425.
ReplyDeleteNot OSR I know but Dungeon World is on 1430.
ReplyDeleteThe Talislanta Community certainly deserves a place on this list. It's definitely Old School, even if we only have 143 members.
ReplyDeleteThanks, I added your updates!
ReplyDeleteHere are some others. The various Fate groups add up to a large Fate community.
ReplyDeleteFate Core (Fate)
https://plus.google.com/u/0/communities/117231873544673522940
2355 Members
Diaspora (Fate)
https://plus.google.com/u/0/communities/108420228611056086227
447 Members
Fate Points (Fate)
https://plus.google.com/u/0/communities/101739075973437810275
121 Members
Dresden Files (Fate)
https://plus.google.com/u/0/communities/103623211858736375716
123 Members
Cortex RPG
https://plus.google.com/u/0/communities/107179089720484737857
430 Members
Mouseguard
https://plus.google.com/u/0/communities/106749458832836449079
248 Members
Shadowrun
https://plus.google.com/u/0/communities/103623211858736375716
152 Members