Pillowfort is an art site much like Tumblr, only with some different features and most importantly allows NSFW stuff! I personally find it a breath of fresh air after having to use Twitter for so long. It makes more difference than you'd think, being able to see an entire pic at once and posts being able to have more than four at a time. And it being pretty much just art too.

You can sign up here if you'd want: https://www.pillowfort.social/

And mine is here, though it's not as updated as my FA page: https://www.pillowfort.social/Seth65