Utility companies are for all intents and purposes, governmental. Regulating social networks like utilities is one possible course of action our society could choose. But it is not how we do it today.
PG&E is a government-granted monopoly and is close to being part of the government itself (in that the government gets to decide how much profit the company is allowed to make, and insists they service every individual).
I can see the argument that basic Internet access should be similarly regulated, especially as it uses either public frequencies (e.g. 5G) or public land (sidewalks etc) to provide the service.