Incredible how the subtext here is "loneliness requires healthcare" rather than, say, "loneliness requires coordinated social change". Almost as if the goal is "how can we frame loneliness as an illness and reap some sweet insurance money."
I kind of agree with you, but what does positive "coordinated social change" look like? I can only think of negative ones, like those that occurred with radical political changes, or else explicit/thinly-veiled marketing campaigns for consumer goods..
I do think a backlash is already underway against Facebook, at least. This is a step in the right direction, as social media seems to intensity loneliness. The internet can be a tool for community-building -- I see other comments mentioning meetup.com, and I've met many people through Twitter and other online social channels -- but none of the solutions (by my estimation) seem quite there yet in terms of helping people find groups that might suit them and providing a means for keeping people together long-term.
I actually think the most important solutions rest primarily in land use. The "new urbanism" ideas of walkability and mixed-use buildings seem to encourage more casual interactions (which ultimately becomes deeper interaction over time) as people live their lives. On the other hand, I live in Manhattan and I'm still lonely. It's hard to say what will work.