In the research of users behavior square-root scaling was found between the total number of transitions during a single visit on Internet portals and the average number of unique subpages. A model of portal surfing is developed where the browsing process corresponds to a self-attracting walk on the weighted network with a short memory.The collective character of affective phenomena was shown on a large scale as observed in four million posts downloaded from Blogs, Digg and BBC Forums. To test whether the emotions of a community member may influence the emotions of others, posts were grouped into clusters of messages with similar emotional valences. The frequency of long clusters was much higher than it would be if emotions occurred at random. Distributions for cluster lengths can be explained by preferential processes because conditional probabilities for consecutive messages grow as a power law with cluster length.
The empirical study of user activity in online BBC discussion forums, shows that most posts contain negative emotions and the most active users in individual threads express predominantly negative sentiments. We also give evidence that in BBC forums the initial emotional level discussion plays role of fuel. The emotions driving the discussion dry out, the thread is no longer of interest to its participants and it may die.