Do you suffer from social networking overload?

How many social networking sites do you guys subscribe to and actually use on a regular basis? I subscribe to quite a few, but the main ones that come to mind are :

http://youtube.com/user/juliethegadgeteer
http://twitter.com/thegadgeteer/
http://flickr.com/photos/thegadgeteer/
http://gadgeteer.stumbleupon.com/
http://www.linkedin.com/
http://www.plaxo.com/
http://www.facebook.com/

The order I have listed these sites is pretty much my order of usage. I visit YouTube several times a day as I’m currently obsessed with finding videos of people playing the ukulele (stop laughing!). I could spend hours on YouTube. It’s a complete time suck, but I have learned some things by watching videos. It’s wonderful for finding instructional content. Do you guys have any topics that you like to search YouTube for on a regular basis?

As for Twitter, I’ve only recently started trying to post something at least once a day. My life is pretty dull, so it’s not surprising that I don’t have very many followers yet. At this point I’m not entirely sure what the benefit is / might be.

Flickr rates up there with YouTube as far as being a time waster. I am a real sucker for looking at the What’s In Your Bag picture groups. I’ve not looked in awhile though. Oh boy, now I know how I’ll probably waste my afternoon ;o)

As for the rest of the sites I listed, I subscribe to them and answer email invitations for them, but I really don’t do much else. I know Facebook is one of the more popular social networking sites right now, but so far it’s not one that I really get all that excited about it.

What do you all think of these sites? Are they a waste of bandwidth as far as you’re concerned, or would you not be able to live without them? Let me know what you think.