Wantedly Chat - for business

Wantedly Chat's main features include:

@mentions
file sharing
full-text search
professional profiles
profile search
invitations
desktop versions (Mac & Windows) and browser versions
Wantedly Chat is provided by Wantedly.

About Wantedly:
Wantedly is a professional social network used by more than a million members globally, that helps you connect with people, access to news, and find jobs.