Before revision:  A scale-free network has been adopted for modeling on-line communities so far but is employed here for the aim to represent peoples' behaviors in communities meeting others under additional constraints where the communities are generated but the sizes are restricted reflecting the spatiotemporal restrictions in the real life.
After revision:  A scale-free network has been adopted for modeling on-line communities so far but is employed here for the aim to represent peoples' behaviors in communities meeting others under additional constraints where the communities are generated but the sizes are restricted reflecting the spatiotemporal constraints in the real life.