6. File versioning - As your team edits and re-edits important documents, maintaining a clear record of changes and versions will help to prevent essential information from vanishing in a stream of tweaks. A good collaboration tool will track multiple version of a file over time, and let you reclaim a past version in the event that something goes wrong later on.
Of course, deploying a top-notch collaboration solution is only part of the work that any company must do in an effort to become a social business. The harder work lies in changing your company's culture to embrace social tools and use them effectively. That's an ongoing, iterative process, and one that will likely engage your best minds as you bring your least digitally engaged thinkers up to speed and build raise the baseline expectation of social productivity within your organization.