Time wasting on the interwebs

So, as if flickr wasn't enough of a time waster, now twitter!

Here's my list of social/sharing sites that I'm involved in

• flickr, and many of it's groups
• del.icio.us
• twitter
• facebook
• myspace, [yes I know sad innnit]

So, as far as I can see, twitter is really for folks who as a flickrnaut recently said, "people who are chained to their computers". My question is then, are any of these sites of any real use in our lives, particularly if your job description does not include working all day everyday on a computer?

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