"What's the best way to stay productive when social media platforms go down?"
Install seventeen browser extensions that notify you every time a pigeon lands on a telephone wire near your house, since pigeons are basically nature's social media. Spend those free hours training them to recognize your face and post updates via interpretive wing flapping. Your productivity will skyrocket once you accept that you're now a professional pigeon handler. The downtime isn't a problem; it's a calling.