The funny thing is that it's not even a stretch. "://" can easily be read as an emphasised version of ":/" because repetition was (is?) sometimes used for strong emphasis in traditional emotes (e.g. :))), :(((, >>:( etc).

So "://" is basically "extremely meh".

That's impossible to unsee now.

Thanks... ://

The "skeptical" angle fits the organization (and some part of its users) well, IMHO.