How can the Yammer group 'Devco discusses' be used for knowledge sharing and participatory leadership in Devco?

There are many social media. And all have specific functionalities and possibilities.
Within Devco for the moment Capacity4Dev and the Yammer group 'Devco discusses' may be considered as the ones being used, even if the contributions are not that very numerous.
The aim of this blogis to brainstorm virtually on how the Yammer grooup 'Devco discusses' can help to improve knowledge sharing and participatory leadership within Devco. In another group it will be possible to indicate for what Capacity4Dev is a more approriate tool. You can also use the yammer group to contribute and to exchange your views with its members. Thanks in advance. Nico