As companies grow, it gets harder for employees to connect with one another. Who here can do X? Who knows how to do Y? Who is responsible for project Z?
This problem is addressed outside the 9 to 5 through the internet and social media. Need to make connections in the industry? Go to LinkedIn. Need to find a good local wedding photographer? Google it, or take to Twitter.
BYODirectory is an app for Android, iOS and Windows Phone that can be installed on each employee's device. It allows them to connect with one another within the context of your company.
Best of all, it is entirely driven off of Microsoft Active Directory. Users login using their business username and password, and all data is stored securely in the Azure cloud.