This is the modern day version of the scam thieves did when I was a kid. Back then they would wait for people to post funeral announcements knowing the home would be empty and at what time. I post up information about trips ONLY when I have a house sitter. 🙂 Here is an article I suggest you read:
You often see people post status updates gleefully rabbiting on about trips to warm and wonderfully exotic lands. The swines! However, this blatant showing off can sometimes sadly lead to an unexpected surprise when they return back home… their lovely house has been ransacked and their possessions stolen.