1. An apparatus for taking action based on expression recognitions contributed using a social network, the apparatus comprising a processor and a memory, the memory storing one or more programs that, when executed by the processor, causes the apparatus to: identify a completed activity performed by a first user; identify an expression contributed to the social network by the first user, wherein the expression is a review of the completed activity performed by the first user; identify an expression recognition contributed to the social network by a second user of the social network, wherein the expression recognition is configured to indicate a level of interest or approval of the second user in the expression contributed to the social network by the first user of the social network; determine whether the expression recognition comprises a positive expression recognition or a negative expression recognition; determine a set of likely preferences of the second user based on the identification of the expression recognition; and cause delivery, to the second user, of a recommendation comprising at least one activity based on the set of likely preferences of the second user, wherein determining the set of likely preferences of the second user based on the identification of the expression recognition is based on the determination of whether the expression recognition comprises the positive expression recognition or the negative expression recognition, and wherein the first user and the second user are connected by a previously established relationship or through the expression contributed to the social network by the first user and the subsequent expression recognition contributed to the social network by the second user.