I stumbled on this site randomly one day a few months back at work and the very thing that caught my attention was the name, lesswrong. I read a few posts, maybe one or two, and bookmarked the site. Today, I was in dire need to read something informative, rational, and mind training; just when I started scrolling the bookmarks, again, the title grabbed my attention. Completely forgetting what this is about, I opened the site, in the curiosity of "lessWrong", ended signing up, deciding to be a member. As much as I am excited to read more here, I am looking forward to write something.
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.