Does any part of that address his point though? Almost every single one of those things you mentioned is part of some federated system, which means you can be the only person in the world not using it and not have your usage affected too heavily.
Your friends can include you in text groups no matter what carrier and phone OS you use, they can include your email even if your mail server is located under your couch, you can visit websites even if you use Firefox or Safari or IE or Opera or Iceweasel or Edge or Dolphin or.... By contrast, you can't decide to be the only one in your friend group without a Facebook acct and still be included in eg event planning and photo sharing, unless your friends make th extra effort to keep a separate channel open for you. That's what the term network effects _means_.
(Yes, I'm entirely aware that the canned response to this is "they're not your real friends then" or "get better friends"; I personally don't use Facebook for anything but event planning/accepting and the occasional communication with an extended member of the family without having to go through a chain of getting people's numbers. But as to the people that don't recognize any potential benefit to a tool like FB for coordinating meaningful social events, I can't help but wonder if they just have very tiny social circles. This isn't a bad thing by any means, but it's bizarre to assume that that's how everyone socializes)