Also, it's getting easier and easier to work, study and live for weeks without talking to anyone else than the grocery store clerk. I don't think that's a particularly good thing from a mental health perspective.
Talking with your mouth, or talking? Because it's not clear to me that talking online is significantly worse than talking in person at sustaining mental health. I suspect getting a girlfriend/boyfriend will do more for your mental health and social satisfaction than interacting with people face-to-face more.
If you mean a face-to-face bf/gf, you're not actually disagreeing with Kaj. Also, I concur with his points about social deprivation leading to lethargy, based on personal experience.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
If continuing the discussion becomes impractical, that means you win at open threads; a celebratory top-level post on the topic is traditional.