Linked accounts are a hot security topic at the moment; you'll have to decide for yourself whether or not you're comfortable with the associated risks. But Microsoft does offer the requisite hookups to Facebook, Twitter, and Google, among others. This is actually a Microsoft account setting, rather than SkyDrive-specific. That merits mention because Flickr and Google are Windows 8 integrations, not SkyDrive connections. I don't have much use for linking SkyDrive to any of the sites currently offered--Google might be the one exception--so this wasn't an area of great concern. I suspect this list will grow for Windows 8 users, too.