If you are in charge of implementing a corporate social network within your organization, with the goal of making it a collaborative work platform for all, we recommend that you start with a few groups (pilot) and gradually expand.
The success of a corporate social network is determined by the success of each group composing it. If each group brings value to its members, then you won't need to invest in incentive schemes. Also the first launches and success of the first few groups is important to set an example for the next ones.
Start with a few groups and then gradually expand.
Start with groups where there are issues to be resolved or high expectations, where benefits can be seen visibly, immediately and personally.
Avoid starting with groups whose benefits are collective and require a critical mass of members. Instead, simply start with groups that focus on the immediate resolution of problems encountered by employees in their daily work and where the contribution of a collaborative platform will be easily noticeable.
They can be people who are geographically distant, people who have to work with external partners, groups in which there is significant mobility, ... simply people who have to regularly exchange content and who have reached the limits of what email (or mailing lists) can do.
Each mailing list, each section of an intranet can form a group. Interview department managers, cross-functional project managers, site managers if your company is deployed in several locations to identify their issues and how the social network could help them.