I totally don't recommend that. I have different social groups in the different social networks, and use each platform so differently. Facebook is more of my personal/social side, where Twitter is mostly professional stuff. Rarely would I want the same status in both places.
I recommend it. There have been more than a few moments when I've needed to send messages across all my networks, so ping.fm is perfect for that. And I can selectively publish to certain networks while not publishing to others.
I don't think I'd use it as an every day broadcasting system, but it's a nice tool to have in the box.
You've brought up an excellent point. The more your personal and professional lives are intertwined -- think, say, Howard Rheingold ;) -- the less the separation is necessary. When more separate, keeping channels distinct is important, whether through different tools, or through different accounts (such as Mac OS X with multiple users and different accounts for, say, personal and professional (new) Twitter accounts.)
I think the beauty of these simple systems is that they meet needs, whatever they are.
As long as I can select and aggregate, either by post or by stream, I'm happy.
I started using it for our college a couple of months ago and find it handy for last-minute announcements and updates on events, etc. We are adding about half a dozen people a week and I've only lost two followers. It's more experimental than anything right now, though. I considered using it personally, but I just don't have a reason to yet.
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