Don't trust corporations, especially those where one egomaniac has all the power. Use open-source and community driven solutions if you can (like Mastodon).
I never really used Twitter, the only reason I still sometimes check it out is because of some artists that mainly post there. Wonder if there is a site where there's majority of artists and also majority of their newest art too.
Artstation doesn't let you filter out AI art, so there will be AI art alongside human art. There was also some issues about if artstation is allowing AI to be trained on what you upload.
Deviantart had a similar issue, and now have an AI art generator on their site.
Instagram is obviously selling all the data they can about what you do/upload, training AI on it etc.
When you tag your projects with “NoAI” ArtStation will automatically assign an HTML “NoAI” meta tag. This will explicitly disallow the use of your content by AI systems. We’ve also updated our Terms of Service to prohibit companies from using NoAI-tagged content to train AI art generators.
We’ve added an account setting you can use to tag all of your current and future projects as NoAI.