I am on Facebook but use it only for two reasons, reconnecting with long lost friends and promoting my music. Many of the social aspects and game nonsense turn me off bigtime. But, as I said, it's a tool.
I can also say that it is NOT for kids. Some kids are on there but mostly, it's an adult thing, by far. Read the FB story to be amazed... it's insane how fast it grew. Of course, in five years, it might be something else that's hot. But some reports I have read state that FB is the big dog, that it will become ubiquitous as Google. And that is a tall statement. For pro musicians, you pretty much cannot ignore this if revenue is a motive.
I'll consider joining SZ group.
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Bill