Facebook was at $1/user/year in their S-1, Twitter was < $1.
From the SNAP S-1:
"We rely on Google Cloud for the vast majority of our computing, storage, bandwidth, and other services. Any disruption of or interference with our use of the Google Cloud operation would negatively affect our operations and seriously harm our business."
"We have committed to spend $2 billion with Google Cloud over the next five years and have built our software and computer systems to use computing, storage capabilities, bandwidth, and other services provided by Google, some of which do not have an alternative in the market."