Abstract: A system and method for intercepting and storing information relating to communications with at least one device over a network are described. The system comprises: an interceptor configured to intercept at least some communications with the at least one device over a network; and a processing system. The processing system processes each intercepted communication to determine the type of content which is referenced by the intercepted communication. A storage action of a first type may be performed if the determined type of content satisfies a criterion or a storage action of a second type different to said first type may be performed if the determined type of content does not satisfy said criterion. This enables more information to be stored about content types most useful for later analysis (for example page impressions) than for content types less useful for later analysis (for example images and other content types which are not page impressions).