ThousandEyes Internet Insights offers a public outage map at https://www.thousandeyes.com/outages/ that is MASSIVELY more accurate (and faster to detect) than Down Detector because its based on actual telemetry and not on crowdsourcing.
They indicate sharepoint is getting blown out... again.
There will be a more detailed message when we finish the SII on our status page at the link I previously provided, but the short version is we took way more traffic than normal to our platform and the related workers were running out of memory.
No. It requires an account now, and they did away with the recent posts firehose.