As of November 1, 2016, the three most popular global websites by rank are:
1) Google, 1.6 billion unique monthly visits
2) Facebook, 1.1 billion ” ”
3) YouTube, 1.1 billion ” ”
When Google’s website and their entire suite of Web services went down for a few minutes between 23:52 and 23:57 hours BST on August 16, 2013, total global Web pageviews per minute dropped by 40% according to traffic analytics reported by GoSquared Engineering in the UK.
That is a lot of dependence on one global corporation.