Also blocked at work.

Dropbox image url blocked? :(

You must work at the same company I do! Imgur isn't blocked for some reason.

Speaking of which, what is the legality of your corporation injecting fake SSL certificates for sites served over HTTPS?

It's 100% legal and quite common. It's their network, (usually) their computers, their time. Mostly organizations doing that are looking for threats to the business and not employee behavior though, of course YMMV.