People who want to introduce an enterprise social network often face a dual challenge: they have to convince senior management as well as get people to use the network. This presentation addresses both issues and gives you hope: you don't necessarily need active senior management support to get the ball rolling. With community management tactics and by leveraging "killer content" you can change organisational habits that can later snowball into bigger changes.
This was a presentation I did for the Microsoft SharePoint conference in Las Vegas, 2014. The talk notes are here: http://www.businessgoessocial.net/spc14/