[busterarm]

It's an email share link. It's for you to share with whoever. All of those icons are social sharing icons.

? is actually for the query parameters and that's a properly-formed URI.

[j_s]

To be clear (since it wasn't to me; best tag-team approach to trick me into clicking some lawyer's website ever!): ...

The user is expected to click the email icon, then fill in the to: address, with the body pre-filled with the current url.

Most email urls passing query string parameters fill in the address (which winds up in the to:) and subject instead.

[busterarm]

Absolutely follow you. Business decision, wasn't up to me ;)

That said though, best damn lawyer's site on the web, amirite?