A "new social network" or just the same modified?

The concept of "new social network" can be attributed to the platform of interaction between strangers created shortly before knowing it, but are there really innovations in social networks?
It's clear the example of SteemIt, which many people consider innovative because of the fact of mixing money with free time and distraction, but, if we look more closely, all social networks are plagiarism of others, with a touch of different style in its design, —above all—, and some essence of its creator, as a person.
So, taking a little walk to philosophy, if a person —or group of people— can adapt to their liking an entire online format, why do we get so involved in adapting to them?

Now is when the mental block appears, thinking about the amount of social networks and the migrations of the societies do between each one of them.