The help for the Social Networking reads:
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When you turn on Social Network Supervision, you can monitor all the Internet activities of your child over the social networking websites. You can view the social networking websites that your child has visited and the details of each visit.
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A monitored account has visited facebook.com and several other social networking sites throughout the day and this tab (which is the only one that won't display anything in Firefox and must be used in IE) reads:
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Emma has no known Social Network Accounts
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That isn't true, nor are the sites and details of each visit logged on this tab.