[Owncloud] Whatsapp like application

[Hello Dear]

Dear All, 
I have setup OC on our VPS and we have around 100+ users (it's a community project for social welfare activities). 
Almost everyone using smartphones having Android OS and have installed the Android app for OC as well. 
Rather than using Internal Messages / Mails (3rd party app) for the users, can we have another way of chat like whatsapp so we can create our own group ?

Can we have a similar type of app like whatsapp for all users and Admin will be acting as a group moderator ?

Regards

OC Learner 
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