Chatter is a great way to connect your users, especially if your team is working in multiple time zones or locations. If you're struggling with why to use collaboration tools at all, I'd suggest you watch this video.

One the best examples that I've seen is a property team who were managing the entire process from leasing properties with branding to shop merges via Salesforce. All of their notifications were email-based and they were getting 100s per day. By moving these alerts to automated posts into particular groups, the users could not only access multiple updates by using digests instead of per alert, but also choose to control who (group members) and how often they get those alerts.

As I am a Salesforce consultant and work in a service-based organization, we implement / customize Salesforce for our clients.

• Questions and Answers: Helps us to maintain a knowledge base for our sales team.
• Topics: Helps us to align records to a particular theme to which they belong.
• Ideas: The sales team can post their ideas and help other departments to get it delivered if they pass thru a certain threshold.
• Follow: Follow people who have influence in your organization.
• File Sharing: Share files with multiple people/groups

It has allowed some groups to easily get answers from each other on crucial topics.

It allowed us to promote digital activities into internal communication groups.
It helped us to strengthen our digital community all over the world with a dedicated group to share project information and best practices.

It is now possible to share information instantly with all the company without sending emails, but also looking for a topic using the search function.