Panoramio is a photo social network for Google Earth.
You can upload any photo, but to be listed in Google Earth there are several rules you should know so please read over the requirements. They include: no people should be the focus of the photo,The picure should be outside and you add the photo to the map marking the location you took the picture not the subject. There are several more rules but these are the ones I follow closely.
Currently there are just a few groups to join now. Google Earth is experimenting with the social network aspect, and has a long way to catch up with Flickr.
