| http://www.w3.org/ns/prov#value | - Social sign on is pretty important since it not only allows data capture (via the Facebook API) but makes it easy for users to interact using the network of choice, the bar to participate is lowered.There are many ways to allow interaction, especially via the Facebook API and you can get serious with tools such as Gigya and Janrain, these are independent tech web services that act as an intermedia
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