San Francisco Bay Area as a rationalist and effective altruist hub
The San Francisco Bay Area functions as an offline hub for rationalists and effective altruists.
How did it become a hub?
The effective careers research organization 80,000 Hours announced it was moving to the Bay Area in May 2016, with the move completed by October. It was also in the Bay Area for summer 2016. Its 2017 review also mentions moving to the Bay Area in 2017.
The Center for Applied Rationality's 2017 Impact Report found that "moved to the Bay Area due to CFAR" is one of the strongest predictors for a CFAR participant having an "increase in expected impact".
Ward Street stuff.
Especially since 2016 or so (possibly earlier?), there has been a considerable amount of debate about whether moving to the Bay Area is good for individuals or the community as a whole.
"""The reasons for this are not immediately apparent. From the outside, people full of energy and enthusiasm make the pilgrimage to Berkeley, go quiet on social media, and when you finally hear from them six months later they don’t seem like the person you once knew. Something is happening to them, although it isn’t particularly clear what."""
"It's seemed to me for awhile now that the stuff that people are actually talking about in-person (e.g. at CFAR workshops) has far outstripped the pace of what's publicly available in blog post format and I'm really happy to see progress on that front." 
"""The theme of the Bay Solstice turned out to be "Hey guys, so people keep coming to the Bay, running on a dream and a promise of community, but that community is not actually there, there's a tiny number of well-connected people who everyone is trying to get time with, and everyone seems lonely and sad. And we don't even know what to do about this." """
"""4. Ward Street is quickly becoming the center of the rationalist scene in Berkeley. We’re trying to encourage that so that as many people as possible can live near each other and it can feel like more of a community. I’ll be staying there temporarily when I first get to California, and I know a lot of other people on the street and they’re all pretty interesting. Anyway, there’s a house opening up there as the current residents leave, and we’d like to get rationalist-adjacent people to move in. It’s three bedrooms, one bathroom, and it costs $4100/month total. If interested (either in renting the whole house with friends/family, or in just renting one room and hoping two other people want the same), email jsalvatier[at]gmail[dot]com and he can tell you more / help connect interested parties together."""
"Even if you know nothing else, you know to move to San Francisco or New York and hoping something good happens there, rather than sitting around in some dying small town where you know nothing will ever happen and being curious about anything beyond the town is a cultural transgression. This is a strategy open to all."
"""Sending people to the Bay
I know meetups causing people to move to the Bay is a controversial topic, but from my perspective, moving to the Bay is one of the best things a person can do in terms of expected impact on the existential risk landscape. It gives people the opportunity to work at aligned organizations, and to be around hundreds of like-minded people, which (in addition to its social benefits) allows people to find collaborators with whom to start new projects and organizations."""
- "News of the Singularity Institute for Artificial Intelligence". Archived from the original on February 20, 2006. Retrieved February 12, 2018. "SIAI has moved to Silicon Valley. Executive Director Tyler Emerson and Advocacy Director Michael Anissimov are both located in the Bay Area of California, along with SIAI Research Fellow Eliezer Yudkowsky (since February). This should enable us to stay in better contact with donors, and cultivate team members and additional collaborators."
- Holden Karnofsky. "GiveWell's progress in 2012". February 8, 2013. The GiveWell Blog. GiveWell. Retrieved February 12, 2018.
- Benjamin Todd. "80k supporter update - moving to the Bay; cost". May 15, 2016. Google Groups. Retrieved February 12, 2018. "We decided to move and our trustees have approved. We plan to be out in the Bay by August, and fully moved by Oct. The next step is to get visas, which is in progress."
- Benjamin Todd. "80k supporter update". August 23, 2016. Google Groups. Retrieved February 12, 2018. "Moved to the Bay Area for the summer."
- Benjamin Todd. "Annual review December 2017". December 24, 2017. 80,000 Hours. Retrieved February 12, 2018. "We completed our move to the Bay Area, securing visas for everyone on the team by April 2017, setting up our office, and doing the administration needed (though we’re yet to have the pleasure of filing our first personal US tax returns…)."
- Dan Keys. "CFAR 2017 Impact Report". Center for Applied Rationality. Retrieved February 12, 2018.
- "Why Do All The Rationalists Live In The Bay Area?". May 4, 2017. Thing of Things. Retrieved February 12, 2018.
- bendini. "The Craft & The Community - A Post-Mortem & Resurrection". LessWrong. Retrieved February 12, 2018.
- Zvi Mowshowitz. "What Is Rationalist Berkeley’s Community Culture?". November 3, 2017. Don't Worry About the Vase. Retrieved February 12, 2018.
- Elizabeth Van Nostrand. "It looks pretty likely I'll move to the bay...". Facebook. Retrieved February 12, 2018.
- Brent Dill. "Two years ago, to the day, I decided to move to the...". Facebook. Retrieved February 12, 2018.
- Raymond Arnold. "It took me a disturbing amount of time to realize...". Facebook. Retrieved February 12, 2018.
- Alyssa Vance. "Many Effective Altruists think about moving to the San Francisco Bay Area, or have already done so …". April 14, 2017. Facebook. Retrieved February 12, 2018.
- Scott Alexander. "To The Great City!". July 3, 2017. Slate Star Codex. Retrieved February 12, 2018.
- Raymond Arnold. "Notes from the Hufflepuff Unconference (Part 1)". May 23, 2017. LessWrong. Retrieved February 12, 2018.
- Scott Alexander. "OT79: Open Road". July 5, 2017. Slate Star Codex. Retrieved February 12, 2018.
- Zvi Mowshowitz. "Responses to Tyler Cowen on Rationality". September 10, 2017. Don't Worry About the Vase. Retrieved February 12, 2018.
- Katja Grace. "Be my neighbor". July 20, 2017. Meteuphoric. Retrieved February 12, 2018.
- Alyssa Vance. "'Why is the best place to live in the world so much...". August 5, 2017. Facebook. Retrieved February 12, 2018.
- mingyuan. "What Do We Mean By 'Meetups'?". February 7, 2018. LessWrong. Retrieved February 12, 2018.