By Lydia Emery
Think about the last time you were on Facebook. You probably noticed “that couple” – the person who always posts pictures of himself with his girlfriend, or the one who claims that she has “the best boyfriend ever” in her status updates. And then there are the people who you know are in relationships, but there’s no trace of it on Facebook. No “in a relationship” status, no pictures together, maybe no mention of the relationship at all.