Rendezvous is a real-time multi-media (audio, video, screen share, text, and pics) communication webapp powered by BitTorent (for peering) and webRTC (for data and real-time media) - it runs in a web browser on users' devices (mobile, tablet, laptop, or PC) - devices connect directly to each other - no cloud service is required.
The #hashtag is the room id, share the link including the hash to connect with someone. (Note: if you don't connect after 5 seconds try reloading the page.)