Here > News item < (spotted in the 'Technology' section on an infrequent visit to this newspaper site).
I guess it depends on how "open" you are about family and how identifiable, too. But saying you are going away (or updating to say 'Weather is great in Madrid' or somesuch, seems to be damn risky anyway, if you have any commonsense and / or a home you want to remain safe).
OK, maybe it is an age thing, but I see plenty of recent "competitions" now seem to require use of Twitter or Facebook and I for one will not be tempted to use either even if it means being excluded.
It's the people who 'check in' at home that make me laugh. Do they honestly not get that anyone can click on that and be taken to google maps which shows you precisely where they live? It's then that you want to worry about telling the world you're going away.