The sparklines on Downdetector's homepage can't be compared to each other. Spikes that look similar can actually have a difference of several orders of magnitude. Only meta's services have truly large spikes.
That's true and an excellent point. I commented about the reported issues elsewhere mainly because I experienced them myself (google.com and drive.google.com not loading or being extremely slow to load content). That could be entirely sympathetic though - people having issues with Meta flooding other services and briefly overwhelming them.