Their screenshots are of twitter.
That said, the architecture supports not only Twitter but FB-style friending and private group shares; we want to encourage different clients in different form factors, with the advantage being that they'd all interop. No more siloes.
It's an idea terrible enough that it will make people doubt your competence. For me, personally, "building strong crypto" and "lifting the twitter UI because too lazy to whip up some visualization of a simple roadmap" don't go together.
A hand-drawn sketch of the planned UI would look less vaporwarey.