Everything is generated by the client. The tasks, the photos, the voting, are all happening in the human.io client. The rest is just driven around by the script. They write to a database, and the web page is just pulling from that database.
This would be easier for you to see if you installed the human.io client.
I've long thought that something like this, combined with something like twilio, would be killer for letting companies build ad-hoc customer support teams, and letting end users work their way up a customer support ladder (think small ecom sites that don't need a fulltime helpdesk but do need to handle inbound calls occasionally). You could build out a CSR script and route calls accordingly when people call your support line, and use human.io to put the data into your ticketing system / whatever.
It's still not clear to me whether the Human.io users are tagging photos you send them or taking new photos or what.