Location-based biggest social networks are Gowalla and Foursquare. But Gowalla is more tourist friendly. You can add trips and pictures. As I see, there was no trips in Estonia in Gowalla until now. This is simple Gowalla Trip of Lahemaa National Park. Enjoy.
Gowalla Trip consists of five spots...
Vihula Manor Country Club & Spa
You need to only check-in to this five spots and Your trip is completed.