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To be fair, many of the posts without thumbnails are low-quality spam.

The problem is really that there are many posts whose main focus is the text (such as my own) which aren't too low-quality (Not mine, then), and people who avoid posts without thumbnails miss them.

I mean really, would you avoid people just because they happened to lack thumbnails? I probably would, they'd look fairly horrifying, but with your whole evil clown fetish I can never know for sure.

I give scant regard for thumbnails!