I joined Facebook but was reluctant to put too much personal information there. It was astonishing to see so many people have the same name. I was looking for an American friend of 30 years ago and sent a message to 2 of the very many possibilities. Within 24 hours each had replied confirming they were not the person for whom I was searching. I can see that it can be used to generate a community of those interested in particular things. The UQ site is an example of that.
The use of Twitter after the Iranian elections and its role in capturing the image of passengers on the plane that went down in the Hudson gives an idea of how it can be useful "in the moment". It seems far too time-consuming and distracting for regular use however.
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