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.
