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Applications such as Facebook, Twitter and Foursquare brought the massification of personal short messages, distributed in (soft) realtime on the Internet to a large number of users. These messages are complemented with rich contextual information such as the identity, time and location of the person sending the message. Such contextual messages raise serious concerns in terms of scalability and delivery delay; this results not only from their huge number but also because the set of userdoi:10.1145/2405679.2405680 dblp:conf/middleware/AlvesF12 fatcat:fck7cvkhb5h77g4dpwcqljegwq