My sister recently posted an old photo with herself, some friends and me on it. For a few hours all those people who often haven’t seen each other in years met

My sister recently posted an old photo with herself, some friends and me on it. For a few hours all those people who often haven’t seen each other in years met in the comments. It seems obvious to me that a service like Facebook is useful and desirable. The specific implementation has much I don’t like but the concept is great.