Its work is controlled by a tightly knit group of individuals who are completely convinced that they are right. (carlineconomics.com)
Next, the researchers identified the most tightly knit groups in each network and determined how much their members changed over time. (seeker.com)
As an adult, most people tend to form small, tight knit groups of friends with little opportunity to meet new people outside of this circle. (topherpesdatingsites.com)