I also confirm seeing an update on 18th and 19th. As usual, Google with major update will let things fall randomly in favor or not of small sites, then next day small bus sites get hammered with Panda/Penguin incarnation.
Went up on the 18th of May, down as usual on 19th, below previous level. 18th-19th, I bet, was a Penguin, although it's hard to tell now, you know, with all the "AI" they are running (when there's only 1 free spot left above the screen fold in top 10, I am sure their marketing people lose much sleep on how to take that last free spot away from us fellow webmasters, you know... with their all powerful "AI").
This time they are getting it tighter , to not let small sites and businesses enough breathing room.
>> @reseller: As far as Google Algorithm Updates are concerned; we shouldn't expect ALL websites to be affected by a specific Algorithm Update.
Not entirely correct. This would be true if G just randomly chose sites based on quality. But when they chose sites based on them being big and having large link profiles and visually appealing pages. And for paying G via Adwords. However you don't see many webmasters of big brands and Amazons-Walmarts-GoogleWhitelistedFriends who are gaining all the space hanging out here, do you? No need for them.
[edited by: smilie at 6:34 pm (utc) on May 22, 2017]