Salesforce Chatter is a sort of intranet Facebook that gives team members a way to update their own status and track the status and activities of their collaborators. They can form and join groups and share information privately and securely. Chatter Mobile (free for the iPhone and BlackBerry) lets you update your status and add comments via your mobile device. You can also take photos with your device and upload them into the Chatter stream for coworkers to peruse. In addition, it gives you the ability to call, e-mail, or even text message a colleague from your phone by accessing that person's Chatter profile.