We’re not aware of any way to send a notice solely to those with hidden profiles, and if we emailed everyone there’s a good chance we’d get flagged as a spammer. We agree it’s unlikely anyone would have gone to the trouble of putting sensitive info in their Profiles and then hiding them. We’re thinking that, if we decide to go ahead with this change - and the reaction seems positive so far - we’ll post a global announcement a few days in advance of implementation to give people a chance to review what they put in their Profiles. We’ll provide detailed instructions on how to do this. That ought to be sufficient.