| http://www.w3.org/ns/prov#value | - Hamburger observes that the app appeals to people that want less formality than Facebook but more formality than Facebook-owned Instagram. ???I think most other people are going to stop dead in their tracks when they find out about Slingshot???s unique requirement: you have to send a photo before you can open the one you???ve received,??? Hamburger notes. ???This will be especially confusing becau
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