Mastodon's web interface should probably treat all local and federated timeline media as potentially NSFW and hide the thumbnails by default. Put a toggle button at the top so it's easy to flip the switch when it's safe, though.
Cuz I totally just saw some things that cannot be unseen when I accidentally clicked on the local timeline button while sitting here in a public coffee shop with people standing behind me. Just sayin'. @Gargron
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