I'm sorry but I'm a bit confused with your statement.
No reprint, means no republication, no uploading to other sites without their permission.
Sharing their work is OK, e.g. retweet. Or tweet to them a photo of their works, "Hey I just bought this cool doujin comic by @[artist name]" NOT SCANS though. Maybe some are okay with that, but maybe some others not.
For imageboards sites, idk if they got permission or the artists simply never knew that those exist. I just thought maybe we could be more "civilized" here as fellow Key fans.
And the option to post directly to social media, they're built so people don't carelessly reupload/reprint the arts. That's embedding, and that's entirely different with reprinting. If in any case the artist want to delete a specific drawing for whatever the reason is, the embedded one is also gone, while the reprint stays. Maybe it sounds great for fans to keep the reprints for archive, but if the image happen to offend someone and the artist want to take it off, we ought to respect them and who knows if they'd be bullied just because "a fan" happen to have a copy of their bad image and share it to the world.
Strictly speaking, that would be yes. Unless the creator - whether it's official Key or someone's fanart - made them specifically for twitter icons (because why would they made them icons if they weren't meant to be used)
I've seen some cases when the artist outright said that (s)he doesn't allow people to use their art for profile pic or icons. But yeah, who cares about that.
That's a good idea indeed. But instead of putting everything into Aspirety's hand, I'd rather suggest for the reprinter to ask before reprinting. So everyone gets their own share of work.
The problem though... People don't usually ask because they think it's too much hassle, there are language barriers, they are afraid that the artists won't let them "share" their work etc. Actually there are templates in Japanese if you want to ask (you can look that up) and usually the artists are willing to let people reprint their work. But still, for courtesy I think it's better to ask.
Also sorry for the lengthy discussion. If it feels OOT and improper, the mods have all the rights to delete these whole conversation. We've been a sinner for to long, there's no meaning for us to atone now.