1. A method for aggregating scoring of tagged content across social bookmarking systems, the method comprising: obtaining, by a processor of a server from over a computer communications network into memory of the server, a tag score measuring a frequency of a tag for content within a corresponding social network associated with a particular social bookmarking system executing in a corresponding social bookmarking server, where the measured frequency of the tag indicates a number of tags applied to all content in the particular social bookmarking system and a number of tags applied to particular content in the particular social bookmarking system; combining, by the processor of the server, tag scores for the tag across multiple different social bookmarking systems into a single aggregate tag score after obtaining tag scores for the tag across the multiple different social bookmarking systems from over the computer communications network into the memory of the server, but limiting the multiple different social bookmarking systems to include only a pre-specified number of social bookmarking systems within a specified geographical region, where each different social bookmarking system executes in a corresponding social bookmarking server and is also configured for coupling to multiple different computing clients with respective content browsers, each corresponding social bookmarking server measuring a frequency of tagging content as a social bookmark; and, visually presenting, in a display of a computer by the processor of the server, the single aggregate tag score within a respective content browser of the computer.