Ya I'm wondering the same thing, installed it. It asked me to add a group - added it gave it a name now there is a group showing. Inside it, It asked me to add contacts. Thought I could add anyone from my contact list but no. It is just displaying 8 out of few 100 and I don't know why they are the chosen ones . But anyways added couple and also updated my status with geotag now waiting for what happens next...

EDIT: It also lets you search via email for contacts to add, tried with few but it just said couldn't find