Feel whatever you want about Zuckerberg, the company, their products and anything else, but what they created is simply the best digital distribution channel besides Google. Many business are built and scaled on Facebook Ads.
Putting opinions about privacy and politics aside (which are definitely topics that should be discussed), Facebook was the last Silicon Valley company to create something that literally has disrupted the way we live and interact. All the other ones that supposedly were on that road are barely alive (e.g: Uber).
In contrast many of the current public tech companies with promising trajectories of global disruption (for example Shopify) were created outside of Silicon Valley.
This is my personal opinion, but I think the golden Silicon Valley days are way in the past.