I'm not a huge user of Reddit. That being said, with the death of G-Plus, the refugees of the various OSR communities have been exploring Reddit as a replacement option.
https://www.reddit.com/r/TheOSR/ is a recent addition to the OSR scene on Reddit. Surprisingly, it is very heavy on sharing various posts from The Tavern (not shared by me). It needs more sharing from the OSR at large to be viable, so if you have links to share or conversations you might want to have, give it a peek.
FYI - the original OSR Reddit community has over 5k subscribers: https://www.reddit.com/r/osr/
Dungeons & Dragons - Monster Manual II -
4 minutes ago