My general sense is that I see a lot of interesting people go to Twitter when they are committed to being on the outside of most elite institutions, but still want conversation. And Twitter gives a lot of control in who you see, and makes engaging those people in conversation very low cost. I think there's a valuable contrarian cluster on there.
If you want to explore the community more, I recommend reading the Library, checking recent Curated posts, seeing if there are any meetups in your area, and checking out the Getting Started section of the LessWrong FAQ.
The Open Thread sequence is here.