join an art, pottery class, even if not that interested, a new hobby say, or take up dancing, whichever type you prefer. It depends on whether the idea is not only to make new friends, but find a partner, which can be a lot more difficult. I would not join facebook or any of that nonsense anyway.
If you are bored, then visit someone in hospital, or be a volunteer it's funny how that has a way of making you see things differently, when one is not so self absorbed.