  We extend simple opinion models to obtain stable but continuously evolving
communities. Our scope is to meet a challenge raised by sociologists of
generating "structures that last from non lasting entities". We achieve this by
introducing two kinds of noise on a standard opinion model. First, agents may
interact with other agents even if their opinion difference is large. Second,
agents randomly change their opinion at a constant rate. We show that for a
large range of control parameters, our model yields stable and fluctuating
polarized states, where the composition and mean opinion of the emerging groups
is fluctuating over time.
