Frappr was sold more than a year ago to a company that has since taken it's data and sold it to merchants, etc.
So that may explain if you had an increase in spam since Feb 2010.
I'd suggest someone setting up a Google Map, but it is very precise, so you would have to be willing to risk exposure of private information.
Google Maps can be made 'private' where someone can only go to the map page if they have the URL. That just means it's not searchable.
One good feature would allow visitor to placemark themselves without specifically revealing private info beyond your user name.
I'm not sure of the whole 'privacy' issue.