Someone posted that people are unsubscribing from https://www.reddit.com/r/news/ so I set up a script to watch it.
Output has been as follows:
20160612195100 8957564
20160612195200 8957356
20160612195300 8957145
...
20160612222900 8936378
20160612223000 8936240
20160612223100 8936094
So from 19:51 (BST) to 22:31 (BST) there was a loss of some 21470 readers. That's roughly 0.24% in just 2 hours and 40 minutes. For reference, for the past (nearly) three hours they've been losing over 140 readers/minute.
Does it matter? Is it significant? It will be interesting to see what the numbers tomorrow morning (BST).