There are lots of fragrance groups on Facebook. PLP is probably the most popular one, but the Youtube reviewers also have their own groups. There is Fragrance Swaps for swaps. And even niche companies have put up their pages to connect with people. I'm very proud to be Andy Tauer's friend.
But I don't like the pages of fragrance groups personally. I don't mind telling people real life face to face that I'm in the hobby, but I keep my interest private because I hate Facebook's stance on privacy, so that hundreds of acquaintances that barely know me can snoop at what I do. I don't like that, so I keep it private. I stay in closed groups and I don't except friend requests from people with names like "Joe Perfumelover".
If you're on Peace Love Perfume, my name on there is D. Francis