Edit: All taken!
Pillowfort is a tumblr alternative currently in beta; It's a really nice site with a lot of privacy options, a robust blacklist feature that can target words in either the post or tags, and a really cool community feature that lets you easily find other users who like what you like!
This tweet thread has over a dozen invite codes in it! Join, share your profiles! e: Available URLs in this tweet.
(I'm ClyncyeRudje there! /o/ )
https://pillowfort.social/users/sign_up?invite=ztwfQQdtBtnx5jsiS5ffIw
https://pillowfort.social/users/sign_up?invite=8RdGOBrfhChQWaG_kkdgqQ
https://pillowfort.social/users/sign_up?invite=UuAnUZAIZSg_GXnxQk6fJA
https://pillowfort.social/users/sign_up?invite=bkc_IIwIcp7BlSTt34P1mQ
https://pillowfort.social/users/sign_up?invite=4YRjHzKLVW8sn1mO11sEag
https://pillowfort.social/users/sign_up?invite=tJe9y6f1i0ErGZ9PqcrEzg
got a shipment of fresh codes here!