Phones lines do have that problem, just with a weaker effect on a smaller scale. Phone call spam/fraud is notoriously rampant, to the point where many carriers

Phones lines do have that problem, just with a weaker effect on a smaller scale. Phone call spam/fraud is notoriously rampant, to the point where many carriers & developers create centralized systems to detect and filter calls down to something a person can tolerate. These systems are scored by spam reports and other metrics that I'm not privy to, some of it is T-Mobile or Google deciding what calls should be auto-blocked and what shouldn't (mostly driven by their desire to keep people using telephony, otherwise they wouldn't bother). And the inevitable outcome of building a what-calls-go-through machine is that there are many parties trying to influence the machine. Eg. faking caller ID, evading blocks with throwaway numbers, spamming no-response calls to figure out which numbers are valid to target, faking a robot voice to pretend to be a real person. Practically every modern platform uses centralized systems to filter the noisy world down to something fit for purpose, and sometimes this intersects with political issues. That's no reason to expect a platform like Facebook to become even more political in their stance than the existing level of politicization that is almost impossible to avoid.