Are you moving here because you want to or because of what the articles put in your head?
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If it's the latter your gonna be hella disappointed. Tech companies here spend hundreds of millions advertising it as "very social" place. It is not.
You can't make friends if you cannot get to them. Good luck getting even 5 people in one place for a friend's meal. If you don't have a car the public transportation is unreliable and borderline unsafe.
I'm not being cynical. I met someone recently who said "they wish someone would have told them" lol so I'm here telling you guys. Make sure you do it because you have a reason to other than "changing it up cause your old city sucks". You should try a smaller place if you want community. Going from city to city won't change things for you