  Activity of users on Internet discussion forums is analyzed. The rank of
users is shown to be approximated better by stretched-exponential function than
by Zipfs law. Cumulative distribution function is found as an excellent tool in
analysis of the dynamics of the collective social phenomena. We are able to
approximate the number of blog comments with time by simple functions that
resemble Fermi-Dirac distribution function: probability of posting a comment is
given by $P(t)=P_0(t) / (1+P_0(t)$, where $P_0(t)=exp(a \cdot log(t/t_0))$. It
is argued that dynamics of blog entries by a specific user ought to be related
to personality of each user.
