I think it's useful to have a topic where we can currently see and discuss the progress of feature support for many of the major sites that we upload from, so I've composed the table below:
◯ - supported
✕ - unsupported
― - unsupportable (to the best of my knowledge), or unnecessary
? - not sure
|Works with link/bookmarklet (HTML, single)||◯||◯||◯||◯||✕||◯*||◯||◯||◯||✕||✕||✕||―||✕|
|Works with bookmarklet (batch)||◯||◯||―**||◯||―**||◯*||◯||―**||◯||✕||✕||―**||―||―**|
|Works with link/bookmarklet (direct image URL)||◯||◯||◯||◯||✕||◯*||◯||◯||◯||◯||◯||◯||―||◯|
|Corrects sample sizes||◯||◯||◯||―||✕||◯||◯||◯||◯||✕***||✕***||✕***||✕||◯|
|Supports direct image URL as source||◯||―||◯||✕||✕||―||―||◯||✕||✕||✕||✕||―||✕|
|Bookmarklet fixes source link (to HTML with proper referrer)||―||◯||―||◯||✕||◯||◯||―||◯||✕||✕||✕||―||◯|
|image sample/md5 mismatch/bad id scripts run regularly||◯||◯||◯||◯||◯||◯||◯||◯||◯||◯||✕||✕||✕||◯|
|Replacement scripts run regularly (topic #14063, replaceme)||◯||✕||✕||―||✕||✕||✕||✕****||✕||✕||✕||✕||✕||✕|
|Search metatag available (e.g. pixiv:62729688)||◯||―||✕||✕||✕||✕||✕||✕||✕||✕||✕||✕||―||✕|
|Indexed by SauceNAO||◯||✕||◯||◯||✕||✕||◯||◯*****||✕||✕||◯||◯||◯||◯|
|Indexed by ascii2d||◯||◯*****||◯||◯||◯||✕||✕||✕||✕||✕||✕||✕||✕||✕|
* Does not yet work with custom domains.
** These sites use a single entry for each image.
/large/ on Drawcrowd,
/w650 on BanCiYuan,
/440_330/ on Medibang
**** Not possible to replace from Amazon S3 yet.
***** Very partially indexed.
If anyone else has more ideas (additional sites and what not) or ways to add support then feel free to contribute. This doesn't cover all of the available sites -- I've left some out because they're either very rarely uploaded from (e.g. weibo, fc2) and/or defunct websites (e.g. Twitpic).
Wix support might be added. I'm in favor of it. There's been a number of artists that have been using wix to provide images of their artwork (post #2743138, post #2744357, etc), although it's still a rarity. Some notes:
To avoid uploading image samples from Wix, you need to strip out a lot of the link parameters. A link may look like something like:
Whereas the correct link to the image (for the full-size) is:
Source link should point to the website afterwards if necessary, or can be left directly if from the artist's homepage, supposedly.
06.06.2017 - Fixed a few mistakes, added new rows (Fixes sample sizes, Userscripts, API).
06.10.2017 - Pawoo API link added.
06.21.2017 - Extra support for multiple sites added. Translated tags row added.
06.22.2017 - Replacement scripts run regularly row added.
06.25.2017 - Some stuff updated. Buncha support added for Nijie, Pawoo, among other sites.
07.13.2017 - Better support for Tumblr (bookmarklet/upload page, commmentary, tags).
07.18.2017 - howto:nijie written, got that squared off.
08.04.2017 - Support for Tumblr does not include custom domains.
09.12.2017 - Added new row: Indexed by ascii2d
Updated by Mikaeri