Merging two or more user groups for collaboration includes constructing a social graph of each user of a plurality of users within the two or more user groups based upon a user profile and a workflow associated with each user. A weighted adjacency matrix is calculated based on at least one user interaction between two or more users indicated by the social graph. A model inferring leading edge contributions and least significant edge contributions among the users is generated based upon the social graph and the weighted adjacency matrix. One or more prospective groups expected to be involved in a future collaboration are identified based upon the identified leading edge contributions and least significant edge contributions.