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This is where the Google+ world starts to look a bit different to other social networking services.
Google's social network is designed to enable users to group people they know into distinct groups - called Circles - rather than having one massive Friends list, so users can better target content they are sharing. Anything you post to Google+ requires you to specify which Circles or individuals you want to share it with. There's also the option to share content with people who are not on Google+ via email.
Google's Circles system makes adding people to your social network a bit less formal than Facebook's emotive Friend button, by encouraging users to drag and drop people into different Circles. You can create new Circles, and also rename the default suggestions which are Friends, Family and Acquaintances.
Google mines your email history to suggest people you might want to add to Circles. However, the data mining is pretty crude. NO-REPLY@Flickr.com was one of my suggestions, along with email@example.com. Not the best contact recommendations I have ever had.
There are also options to find people via Yahoo and Hotmail, although not via Facebook at the moment.
Image: Google/Natasha Lomas/silicon.com