When the economic model is advertising and data tracking, the types of apps/services that are available are the ones that work best with advertising and data tracking. And it turns out that consumer-oriented social sharing services fit that model pretty well. So that's mostly what we have.
Those services do have value. But I think it's limited. When I walk into a cafe with a beautiful view and everyone is on their phones, or when people awkwardly scroll through Twitter at a group event instead of enjoying the world around them or interacting with strangers....I dont see people gaining value. Especially when it's children doing it. I see compulsive addictive behaviour that erodes human value for the benefit of advertising companies.