Is the app/site “Playfull” a scam?

http://www.playfull.com/
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I see adds for Playfull all the time on Snapchat and Instagram saying “Play League, Win Free Food.” Has anyone tried this? Is it legit or is it a stupid scam or something? Thanks!
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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