Don't even think it's invite-only, just an unannounced "beta". I didn't get an invite and went to what I expected the url to be and was able to login just now.

Don't even think it's invite-only, just an unannounced "beta". I didn't get an invite and went to what I expected the url to be and was able to login just now. Will probably never really use it over the Android App, but glad it exists.