Facial Recognition by FB - Get notified if someone tries to use your photo on Facebook
Trustroots - Travellers community for sharing, hosting and getting people together.
Knoto - Send photos to friends automatically using face recognition
BeWelcome - Open your door to the world!
Facesoft - The world's most accurate face recognition algorithm
Hospitality Club - Free network of people around the world who offer free accommodation, advice and help when they are traveling - hospitality exchange. Free membership.