Ringback
mobilemusicblog.com

A history of the mobile-music era, 2004–2010 — the ringtone boom, the carrier stores, the iTunes phone that flopped and the iPhone that ended the argument. Written from period sources.

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This form reaches the publisher of Ringback. Corrections are the most valuable thing in it: if an article misstates a date, a price, or a fact of any size, say which article and which sentence, and it gets fixed. Source leads are a close second — this era deleted most of its own record, and people who were there often hold the only copy of it.