http://3cbzkrvakrpetjjppdwzbzqrlkmzatjs7jbyazap5gwutj32gcltjpqd.onion
With the rise of the very large platforms — and here I mean CompuServe and AOL at first, and then Facebook, Twitter, and the like later — the low-friction option of just choosing a different place started to decline. You could participate on a Fidonet forum from any of thousands of BBSs, but you could only participate in an AOL forum from AOL. The same goes for Facebook, Twitter, and so forth.