A few ideas:
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Ads: Offer users a way to show ads on their device and they could get paid for it. Could be done with a DSP
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Photos from around the world - The wire services post a roundup of photos daily from big news events. Would be a cool feature to have them displayed
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Sports scores - Can you add more teams like Premiere League or World Cup Qualifying?
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local high and low tides would be great too
Love my Tidbyt!