I could just as easily publish a crypted link to "invite" someone to join. As
long as they have the link they can "Join" and start posting. The only
advantage Stas' method has is that he simply started an advertising campaign
for the echo on his own. I suppose that is fine and dandy. Let's see how this
takes off.  It is far easier for someone to click on that link and see the
landing (advertising) page and be encouraged to install Telegram, than it is to
install Telegram first and post something to an existing user to wait for
approval.

--- tg BBS v0.6.2