I see this sentiment expressed a lot and, frankly, I just don't buy it. I dropped my FaceBook account years ago and have never had any trouble staying in touch with people or being invited to things. Are your friends / family so insistent on using FaceBook for all communications that they would cease including you in events or talking to you if you needed to be contacted via, e.g., text message or email? If that's the case then I suggest you seriously consider the kind of relationships you have with these people and whether or not they are worth maintaining.