Some people are dreamers .
Some are schemers.
Some need the validation.
It takes all kinds.
There's pressure to be cool.
With your wife maybe think of FB as the modern day lifestyle magazines that us ladies had years ago
. Social media has replaced the magazines but still lets people peer into others successful lives, read about the royals, read goss..all that crap. It's all escapism. Some get caught up in the hoopla and it can have devastating consequences but others are just enjoying the activity. Maybe she doesn't expect you to solve that house unattainable dream but wants to discuss and include you just in that way....us women are weird like that.
Plus most people grow out of being influenced by fakes so it usually passes.