I believe Alexa provides this data in real time, or something close to it, so the ranks on that page are subject to variation. I collected the data on June 3.
If you have a look with the archive.org wayback machine, the most recent available snapshot from April 1 shows VK outranking Facebook: web.archive.org/web/20180401190211/https://www.alexa.com/topsites/countries/NL
A snapshot from June 7 shows reddit outranking facebook in the US: web.archive.org/web/20180607191646/https://www.alexa.com/topsites/countries/US
For Canada the nearest snapshot to my data collection is July 25, where Facebook outranks reddit: web.archive.org/web/20180725010932/https://www.alexa.com/topsites/countries/CA