I don’t see other social media as opponents of PPro. They serve different purposes.
For information, knowledge and in-depth discussion, PPro is The place.
I’ve also made a few watch loving friends through my IG account (luis6_kch), which was set up only for recording my daily wrist fun.
The interactions between me and IG friends are more personal-to-person, where as here on PPro we really have the sense of a community.
As for FB, it’s mainly for my networking with family members and friends. Nothing to do with watches.