Social media isn't faster or more efficient than email though. In fact it might be slower due to the amount of clutter and ads encountered when using facebook. The comparison between phones and post doesn't really hold up.
Same one as you. I can email my entire family just as easily as I could tweet them and with fewer restrictions.
Since you have directed this in an uncivil course:
In what reality do you live where "email is to twitter as postal mail is to telephone" is a true statement?
It depends on how technically savvy you are. You may be able to post a video to your server and have a script automatically email all your relatives.
Less technical people will record a video, choose the share action to post it online, then all the people that are following will see it in their feed.
If the feed algorithm surfaces it to them. I’d wager many social media users only consume content though the feed and not by going directly to people’s profiles to see what they’re up to, so may never see everything.
That's a good point. Likewise, with email there's always the chance that the spam filter could hide the message and lots of people never check their spam folders.
> the true value of social media is as a channel for advertising?
That's probably too narrow. The value for me would be as a channel of communication.