Hi,
I have posted an IDEA on SAP Idea Incubator, about Chat System in SAP through all Interface like SAP GUI, UI5..
It's same like other chat system but one thing i have to say..we are working in business world and sharing business information through social chat application is not at all suggestible. That's the idea to share the business information like document no, business mail id's, any other business related information though inside business application.
I have made an application in SAP Netweaver platform, where two or multiple logged in user can share the information through SAPGUI chat application.
Please find below link, where i have given all initial step about the application.
The same application i have started to build in SAPUI5 platform, because now a days most of the users are using FIORI application through there hands on devices.
Additional information would be more help to add some more feature in application.
Thanks & Regards.
Praveer.