"This was well before Facebook, and unless you were paying attention I was easy to not notice. It was 2007"
Not to be overly pedantic, but facebook was around in 2004, so this was well after Facebook was around, I'm afraid. I was personally on FB at the end of 2005.
It's not really set in stone, from here[0], for instance - "Technically, since "mouse" is an acronym for "manually-operated user-select equipment," it could probably be pluralized as "mouses." But since hardly anyone is aware of the word's etymology, and because it sounds less awkward, most people pluralize it as "mice.""
Not to be overly pedantic, but facebook was around in 2004, so this was well after Facebook was around, I'm afraid. I was personally on FB at the end of 2005.