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I'll bet this backdoor to taking over an abandoned group on Facebook won't be open for long, but while it is, there certainly are some significant implications for individuals, causes but also lightly-branded corporate groups (say a group that was started by some employees but then shuttered by a corporate mandate). And it certainly is another lesson that social networks are valuable tools that are not fully secure.
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Lots and lots of great links to different types of search engines - all geared to help you search the social web. Useful for brand and reputation monitoring. Found because of a request from the delightful @BookMadam.