Instagram founders Kevin Systrom and Mike Krieger launch Rt.dwell, an up-to-date tracker of how fast COVID-19 is spreading in each US state (Josh Constine/TechCrunch)

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Instagram founders Kevin Systrom and Mike Krieger launch Rt.dwell, an up-to-date tracker of how fast COVID-19 is spreading in each US state  —  Instagram founders Kevin Systrom and Mike Krieger have teamed as much as launch their first product collectively since leaving the Facebook mothership.