A note left on the kitchen table by your flatmate.

A student introduces herself on the course's message board.

An email to the class on a Friday afternoon.

A postcard from a friend on holiday.

A message from a friend, on a Wednesday.

Two friends texting at eleven in the morning.

A noticeboard in the corridor outside the language department.

A voicemail, written out by the person who took the call.

A page from someone's diary, written on a Monday evening.

A note slipped under the door by someone who has just moved in.