The "FAANG" (Facebook, Apple, Amazon, Netflix, Google)
I like this abbreviation 
About the OP title, I don't think they were our friends. They get our wallet, time, and personal data. Truly a shitty friend.
Apart from Facebooks try with Libra, is there anyway they could start competing on the blockchain world? My take is that they should.
They are too late. Many companies, including IBM, Alibaba, nChain, etc., already have lots of patents. They (FAANG) should explore and do more research if they want to be relevant in the future.