This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
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Demoscene
fenarinarsa.com
Posts related to the demoscene!
Looks for relevant words, URLs, and adds demoscene-only accounts from a list.
It doesn't look for specific plateforms though - Amiga, Atari, Amstrad, C64, Apple II, ZX Spectrum etc. but it may be about retrocomputing as well.