I came across this yesterday.
http://news.bbc.co.uk/2/hi/uk_news/6910826.stm
When I posted it on other groups I belong to, one person added this (in a UK context):
'The other thing they're being used for, apparently, is to check up on potential employees and students (the latter being mentioned on the news last week).'
This is a potentially dangerous issue for all of us here, and I feel strongly enough about it to "waste" five points to post this as a question, as there appears to be no other way to communicate this to everybody. If you have any experience, yours or a friend's, or have heard of other dangers please share them with us.