Whilst I use Facebook pretty much daily, I don't install apps or anything like that, and keep it to people I actually know. I find it great to keep in tocuh with friends who are rubbish at keeping in touch. Furthermore over 80% of my friends don't live in London. Addtionally 20% of my friends don't even live in the UK so it makes it nice and easy to keep in touch that way.
It's easier and quicker than typing out an email to all of them regularly - and it's far more visual. It's nice to share pics of nights out or parties or places you've been with people you care about that can't be with you.
The majority of my family don't live in the UK either so again it's a great way to keep tabs on what's going on in their lives - sure we chat on Skype from time to time, but at least this way you get live data and a feel of what's going on with their lives on a day to day business. All big news clearly, you know about far sooner.
So, yes I use Facebook, but I use it for the use that I need from it. Keeping in touch with friends and family that I can't see regularly - it's made keeping in touch with people easier, and if anything has brought a lot of my friends and family in a better state of contact. It's good to embrace things which are helpful - rather than snub things because you're not interested in it.