Facebook is trying once again to enter the increasingly crowded_ephemeral messaging app market with Slingshot, a photo sharing app. But unlike Snapchat and other services, before you can see a photo, you need to reply with a photo of your own._ The app is the social network’s second attempt to take on Snapchat. The company’s Poke app launched to much fanfare only to fizzle out quickly and get pulled from the App Store. Unlike Poke, which was pretty much a Snapchat clone, Slingshot adds another element to the mix. By forcing you to send a picture (or “sling” as Facebook...

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