16:17
The site certainly throttles sign ups. At unannounced times it let's in some people without an invite. At other times. People with recent and legitimate invites cannot join.
Auto correct on iOS is spelling for me. Forgive poor punctuation
It's fairly nice once you're in, some snazzy web app fun animations. Lots of work to curate, new terminology. Most don't know what to do wth it.
Lots of FIRST and just testing and exploration. Few are making great use of it.