1. A method for detecting an event from a social stream, the method comprising the steps of: receiving a social stream from a social network, wherein said social stream comprises at least one object; and wherein said object comprises a text, sender information of said text, and recipient information of said text; assigning said object to a cluster based on a similarity value between said object and said cluster; monitoring changes in at least one of said clusters; and triggering an alarm when said changes in at least one of said clusters exceed a first threshold value, wherein at least one of the steps is carried out using a computer device.