I have a two-mode network which looks into relationship between forum threads. Two forum threads are connected if the same user has replied to both. The nodes are sized based on number of people who have only replied to the given forum thread, and no other ones (it would be the users who are unique to the given thread) and edges are the number of people who were active in both of the threads.
However, there are multiple problems with not doing anything with the edge weight:
1.) If there are two threads that are very active and have 500 users replying to them, and they have an edge of 100 between each other (100 common users), it shouldn't be as significant as if two less active forums share 100 common users;
2.) How do I solve the problem of a very active and a less active forum thread being connected, if at all, without using parallel edges?
What would be a good way to calculate significance of edge weight?