Flickr, in my experience, is the least bad of the photosharing services. It's been stable, it doesn't screw with images much, allows full high res downloads of original images, and keeps comment spam under control.
But it has a recurring transient problem where uploads just fail at the "Verifying" stage. And I am currently being afflicted by this. Frustrated.
I still can't upload large images to Flickr.
So I opened a support ticket this morning. I got a reply from a human in 15 minutes acknowledging that others have reported similar problems and promising to keep me updated. At no point was I asked to restart my browser, reboot my computer, or turn anything off and on again, nor did they try to gaslight me by claiming no one else has complained. They just acknowledged the problem and promised to fix it.
Remarkable enough to be notable these days.
Still unable to upload large (> ~90MP) images to Flickr, which remains frustrating (though I still appreciate their support people's forthright responsiveness to my queries about it). It had worked fine in the recent past.
I can downsize before uploading, but that negates one of the biggest advantages Flickr has for me over competing services, which is the ability to upload full res images and have them do the right thing with rescaling.
I hope they fix this soon.
@SteveBellovin @mattblaze In olden days when ISDN BRI was to be found, one could really speed up a download by having the zero bits sent down one of the ISDN channels and the one's bits down the other - and applying simple run-length compression to each stream. I had that in an older edition of the Cavebear catalog of bogus network products:
Matt Blaze
Karl Auerbach
Steve Bellovin
cass 
