I will suggest trying MQTT.
Facebook Messenger is built on that:
https://www.facebook.com/notes/facebook-engineering/building-facebook-messenger/10150259350998920
.

In node-land, you can use MQTT.js (http://npm.im/mqtt) as a client,
Mosca (http://npm.im/mosca) as a broker, and MOWS (http://npm.im/mows) for
a mqtt-over-websocket client.

There are MQTT clients for all major mobile platforms.

Cheers,

Matteo


2014-01-29 Anurag Prasad <[email protected]>:

> Hi,
>
> We are looking to build a scalable Instant Messaging application. I came
> across messenger.js and found it useful in scaling up with multiple
> servers. Any recommendations?
>
> Regards,
> Anurag Prasad
> Birla Institute of Technology & Science, Pilani
> Pilani Campus
> Pilani, India. 333 031
> Mobile: +91 - 9001250705
> E.mail: [email protected]
> www.bits-pilani.ac.in
>
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