Mikaeri said:
It wasn't exactly about this particular subject, but I just remember a mention to Weibo in forum #124901, which is why I included it in my list. But we barely source from Weibo, and especially given it isn't primarily an artwork sharing site.
And it's usually not a great idea anyway since social networking sites usually recompress the hell out of the media they're given.
There are some gems on Weibo, they are just difficult to get to because of the language barrier and convoluted log in system. That being said, I have in fact found a good upload from their (post #2459751), which would not have been found from another source by this artist.
Just because it's social media doesn't mean it should not be considered as a source. For instance we source from Twitter frequently and to a lesser degree Facebook. It's always up to our best judgement; usually another source it better but not always.
So I would say go for weibo bad ids/samples. It would help a lot just to know when this source is improperly sourced or sampled because then we'd know how to correctly source from it. I believe my upload may have been sampled since it has a watermark but I can't be sure.
I use a userscript called "Weibo Big Picture (新浪微博查看大图)." I'm not sure if it actually finds the original but it at least appears to find a larger image.
Thank you for the link to my earlier comment.