What are some alternatives?
Workplace by Facebook - Connect everyone in your company and turn ideas into action.
Bitrix24 - Bitrix24 is a free (for small businesses) social enterprise platform. It is a united work space which handles the many aspects of daily operations and tasks. Create your own social intranet in minutes!
Zoho Connect - Zoho Connect is a team collaboration software that helps teams ideate, discuss, and work together, from any place, on any device.
LinkedIn Premium - LinkedIn is a social network helping brands and professionals to connect, identify sales prospects, hire talent, and promote their business.
Yammer - Yammer is a leading enterprise social network used by more than 200,000 companies worldwide, including 85% of the Fortune 500, to get work done smarter and faster. Sign Up Today.
Salesforce Chatter - Salesforce Chatter provides a suite of collaboration features to any application built on Force.com.