One feature that I've seen successfully used in a competitor's enterprise social platform (Jive) was the ability to create custom Feeds. I think this has to potential to have one of the greatest impacts on adoption for the following use case. On each individuals Yammer home page you have three Feed tabs: Discovery, All, Following. If we were able to create 2 (or even 1) custom feed tab(s) that you could name, you could care Feeds that would allow you to scale knowledge within groups very, very quickly. In Jive, I was able to create a feed that consisted of the Top 100 executives. This was a very powerful information scaling and engagement tool. Within 5 minutes everyday, I knew what was top of mind for our senior leaders and I had an opportunity to engage with them. This worked even though Jive wasn't available on mobile devices. Since Yammer is, and works well on mobile, Senior Execs should have no trouble getting into the Yammer app reading their Feeds and posting relevant insights. The second Feed that I created was typically the 2-3 key projects and key stakeholders (who may not be specifically on project pages). You can do all of this through the "Following Feed" but it's a lot of information to sift through each day.