1. A computer-implemented method comprising: identifying, using one or more computing devices, a first set of visits to one or more webpages by a first participant of a social network; determining, using the one or more computing devices, for each of the first set of visits to the one or more webpages, whether the first participant received a social annotation during each of the first set of the visits to the one or more webpages; identifying, using one or more computing devices, a second set of visits to at least one of the one or more webpages by a second participant of the social network; determining, using the one or more computing devices, whether the second participant received a social annotation during at least one of the second set of visits to the one or more webpages; calculating, using the one or more computing devices, a first total number of missed social annotations for each of the one or more webpages for the first participant of the social network based at least in part on the first set of visits to the one or more webpages and the determined social annotations received during said each of the first set of the visits to the one or more webpages; calculating, using the one or more computing devices, a second total number of missed social annotations for said each of the one or more webpages for the second participant of the social network; determining, using the one or more computing devices, a combined calculation of missed social annotations for said each of the one or more webpages based at least in part on the first total number of missed social annotations for each of the one or more webpages for the first participant and the second total number of missed social annotations for said each of the one or more webpages for the second participant; generating, using the one or more computing devices, an indication for a third participant of one or more websites for which to provide a social annotation based at least in part on the combined calculation of missed social annotations for said each of the one or more webpages; and providing for display to the third participant, using the one or more computing devices, the indication of one or more websites for which to provide the social annotation.
1. A computer-implemented method comprising: identifying, using one or more computing devices, a first set of visits to one or more webpages by a first participant of a social network; determining, using the one or more computing devices, for each of the first set of visits to the one or more webpages, whether the first participant received a social annotation during each of the first set of the visits to the one or more webpages; identifying, using one or more computing devices, a second set of visits to at least one of the one or more webpages by a second participant of the social network; determining, using the one or more computing devices, whether the second participant received a social annotation during at least one of the second set of visits to the one or more webpages; calculating, using the one or more computing devices, a first total number of missed social annotations for each of the one or more webpages for the first participant of the social network based at least in part on the first set of visits to the one or more webpages and the determined social annotations received during said each of the first set of the visits to the one or more webpages; calculating, using the one or more computing devices, a second total number of missed social annotations for said each of the one or more webpages for the second participant of the social network; determining, using the one or more computing devices, a combined calculation of missed social annotations for said each of the one or more webpages based at least in part on the first total number of missed social annotations for each of the one or more webpages for the first participant and the second total number of missed social annotations for said each of the one or more webpages for the second participant; generating, using the one or more computing devices, an indication for a third participant of one or more websites for which to provide a social annotation based at least in part on the combined calculation of missed social annotations for said each of the one or more webpages; and providing for display to the third participant, using the one or more computing devices, the indication of one or more websites for which to provide the social annotation. 10. The computer-implemented method of claim 1 , further comprising: providing for display at least one of a first total number of missed social annotations and a second total number of missed social annotations.