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Does anyone know a tumblr-like service that's open-source that I can stick on my server (Nginx/PHP-FPM/MySQL).

I should point out WordPress is far too heavy for a Raspberry Pi, I need something lightweight.

Jekyll? There's not much more than a repo and text files on the admin side, but enables super-fast blogging on light hardware.

http://chyrp.net/ -- PHP + MySql/Sqlite