Yes it is normal for W to seek out old friendships or new ones if she's felt kept away from that for years. This does not necessarily mean that there is any wrongdoing.
I'm not saying this is how your W was, but in my initial fog of marriage and my doormat stage I was kept away from friends for a long time. I now see my best girlfriend for lunch and we make it a regular thing when possible. And I realize that it is CRUCIAL to my well-being to do that.
I guess I'm just trying to say...don't assume the worst here. And if you approach her about the Facebook thing...it won't be good.
