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Saif Farooqui
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I perceive Twitter as a similar solution in the market; following the right people gives me the news and opinion updates I love to read. That said, Twitter seems to be a public good, where lots of people use it (and in some cases need it) but no one is really willing to pay for it. Have you considered how to handle that side of things?
Artifact
A personalized news feed, by the Instagram founders