|Student Protests on the 9th of November shows the route of the protest clearly in tweets over a three hour period|
The obvious answer is age of protestors. The student protests were full of teen agers and college students. These are digital natives who have grown up with the internet who live a great deal of their lives posted on to social networks. People concerned about pensions tend to be older, frankly almost no one the age to use twitter on a mobile phone has any hope for a pension.