Really excited about the recently launched web versions of Telegram https://webk.telegram.org
They are light years ahead of what any other social media service has to offer on the web: fast, slick, fluid, light, feature-rich. To make them 100% complete in features, we are currently testing a functional version of web-based video calls internally, which will be added soon.
WebK and WebZ are by far the most cross-platform versions of Telegram we shipped so far - you can instantly access your chats from both mobile and desktop directly from your web browser. No downloads, no installs.
This is particularly good for corporate environments where installing native apps is not always allowed, but also good for users who like the instant nature of web sites.