I'm not much of a FB user myself, but my wife's auntie (70yo, Filipino, living with us in the US).

- Saw the first pictures of her grandkids on FB

- Organized a school reunion in NY with people flying in from all over the world on FB

- Chats weekly with her daughter working on Singapore over FB messenger

- Writes crazy long prayers for sick friends on FB

- Found former students living locally on FB that she socializes with.

Whether or not FB makes you lonelier or not seems to really be situational and at least for auntie (and many others) they consider it a tremendous positive thing in their lives.