At 7, I would always want them to be in a public room / monitored on their use. Ours never use gadgets in rooms really (iPods, DS’s and certainly laptop). We (And school) have had good conversations about it all and hopefully will continue too.
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Mrs_OAB and I still password lots of stuff on the laptop as well. We are on windows and also use Microsoft Family Safety to monitor and restrict each childs laptop account and go via Open DNS. iPods are locked to my account, and the boys do not have password so have to ask to update/purchase apps. Router also has time controls on to shut it off, unless you have password.
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Eldest OAB has a phone, on Vodafone, and that has Vodafone Guardian on it, which again monitors, limits and ‘locks down’ the phone as needed. It also allows him to refuse calls / text and in doing so it sends message to mrs_oab to let her know.
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Ours will never have TV / laptop etc in their room either.
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Sorry to be firm, but I think that intermanerd is probably the biggest risk to our children, and their childhood going. Having said that, ours too have access to facetime & skype for family, email accounts as they need, phones as they get older etc etc.