Since I'm a member of pixiv and dA, I'd like to just bring up a rather, let's just say inconvinient problem.
In case any newbies don't know, sending notes are the way for PM'ing others here on this site, and for others to PM you.
The format is most definitely including: User's name in a 1st blank, subject in a 2nd, and the big box is where the note gets typed.
On pixiv it's slightly different. Only when you are on the page of another pixiv member there is a 'Send Message' button. For final checking once the PM is typed there is a preview button. After hitting that and confirming that the PM is 100% right, hit the send button...
The ONLY problem with that is the lack of a 'Save as Draft' function. On dA there is such a button in case you don't feel like sending it now, but there is none on pixiv.
If you think this is a serious problem, please do comment below.
P.S: This is Only for people who have BOTH pixiv and dA accounts...