We've all got them.
That friendship you haven't expelled an ounce of social effort to maintain other than hitting 'Accept' on Facebook in a truly British moment of "Well, it would be more hassle to reject it." A relationship better described as 'fleeting acknowledgement of a fellow human being' than 'friend'.
A nod across a crowded website. A number on a social network. A link of data.
But you've not deleted them, have you? Lord no. That would be rude. Worse still, it would detract from what you actually use Facebook for: a venue in which to indulge in the art of digital people watching.
These are the 10 characters you should almost certainly have removed from your life, yet still haven't.