A classmate from university who you havent seen for 15 years, a friend-of-a-friend from a party or a colleague youve never spoken to  they are all Facebook friends in the same way as your best friend, or your husband or wife, or your mum.

A classmate from university who you havent seen for 15 years, a friend-of-a-friend from a party or a colleague youve never actually spoken to in person  they are all Facebook friends in the same way as your closest friend or your spouse or your mum.
