Personally, when I use a public computer anywhere (library, school, etc.) I don't go to any site that requires any personal information. I don't check my e-mail, I don't come here and I certainly don't go diddling with my bank's website.
I was at school one afternoon and the big braggart of the class (everyone has them, right?) was telling everyone that he was going to order his computer today. In fact, he said, I'm going to order it right now. He made a big show about what he was getting, pulling out his credit card and making sure that everyone knew how much it cost. When he was done, one of the fellows from my group went to the same pc, brought up his history and displayed the pages where he had entered all his personal information. The last page had cleared out his credit card info, but everything else was left alone. Home address, phone number, shipping info and all the rest, just waiting for someone to come along and find it.
It's very rare that I mention it to somebody if they're doing something risky. I feel that if you're going to use the technology, you better have, at least, a nominal understanding of how it works, especially if you're going to diddle around in personally sensitive stuff. I won't take advantage of them, but I'm not their nursemaid either. The only exceptions I make are for the older folks who look like they're struggling. If I see a little old lady on a pc in the library accessing her credit card account and such, I'll stop and mention politely that that probably isn't a good idea.
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No signature. None. Seriously.
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