Small social network with the search, contacts, tags, profile and settings, requests for adding, built-in Google map with user's contacts. To add the user you search for him, request for adding. If he\she accept you can see the profile, make notes and assigns tags for the particular user. No one but you can see those notes and tags. You can also see the list of all user's contacts and mutual contact list.

On the contacts page you can see all users in your contact list, or users marked with the special tag only. On the map page you can the the map with the markers displaying your contacts. An additional information is displayed by clicking on a marker. On the settings page you can enter your address, which would be validated by Google geocoding API. You can set up conditions for search here also.