Ask HN: How would your life change if Facebook/Twitter disappeared?

Thinking about the big tech giants, it's quite obvious the world would pretty much fall apart if Google disappeared overnight. On the other hand, I wouldn't lose anything if Facebook/Twitter were to meet the same fate. We then have the likes of Netflix/Amazon/Uber who provide useful "convenience luxuries" but nothing life changing in my opinion. Curious to get the HN perspective on this, specifically, a view on the company valuation in the context of obsolescence.