A method for ranking entities with respect to a tag for targeted advertisement is provided. For each entity to be ranked, a first score is calculated, which indicates the level of uniqueness the tag is to the entity. For each entity to be ranked, a second score is calculated, which indicates the number of people connected with the entity. For each entity to be ranked, a final score is calculated, which combines the first score and the second score. The entities are ranked based on their respective final scores. Optionally, the entity rankings may be used to determine the cost of advertisement for each entity and to recommend entities with respect to an advertisement.