We might look at social media as a mitigating force in relationships. What I mean is, social media can be seen as a crutch which facilitates relationships while also weakening them. This may not cause estrangement, but if you only talk to someone over the phone, for example, and never see this person face to face, the relationship will likely not progress into real affection. A certain kind of distance is built in.
If we go with the cruth analogy, we might say that like crutches, social media serves a positive purpose but muscles/friendships/relationships will not grow to full strength if the crutches become permanent.
We've got to walk on our own to get full strength back, so to speak.