More and more people today manage their social relationships through social networking sites. A social networking site is a virtual place where people can meet and interact with each other. On such sites, one can use the various features and attributes to present ourselves to the friends we have online. The central question of this report is what characteristics of relationships show on social networking sites. With the features and attributes that are represented and whether the architect for a social networking site affects the relationship between friends. To investigate the issue we have interviewed users of three different social networking sites: Facebook, Google + and LinkedIn. In addition we have also done an inventory analysis of these sites. Our study shows that there are both similarities and differences between these three sites in terms of architecture in which attributes and functions are included. The key areas in which a friend can present themselves on Facebook, Google + and LinkedIn are: home, profile, status updates, messaging, profile picture, friends, adding friends and friend requests. The attribute that most characterise a friend and a user according to our results are profile photo, mutual friends, status updates, recommendations, information page and photo updates. The interviews showed that tagging, categorization of friends, photos, friends and status updates are the attributes that can affect a relationship between friends in that it affects the user's opinion of the friend, in both a positive and a negative direction.