The best way to add Facebook friends? Actually knowing the people helps. The quickest way to lose Facebook friends? Offensive comments.

Those were the findings of a survey of 1,865 Facebook users by Nielsen McKinsey’s NM Incite unit, which also cited solicitation comments, depressing comments, too many friends, and updating too much or too little as reasons for defriending.

Readers: Have you ever defriended someone on Facebook, and was it for the reasons below?