Abstract: Among other things, a user can determine, from aggregated transaction data, private information about a transaction of another party. The other party is associated, in a shared social network database, as a contact with the user. The activity of the other party is related to an activity or contemplated activity of the user. The private information is from a source that is controlled independently of the shared social network database and the aggregated transaction data.

Abstract: Among other things, a user, who is engaged in a commercial activity on a commercial online site, is exposed to computer-stored information that (a) is associated with another user of the online site, (b) would otherwise be private to the other user, (c) relates to the commercial activity of the user, and (d) is controlled by the site.

Abstract: Among other things, a user, who is engaged in a commercial activity on a commercial online site, is exposed to computer-stored information that (a) is associated with another user of the online site, (b) would otherwise be private to the other user, (c) relates to the commercial activity of the user, and (d) is controlled by the site.

Abstract: A wearable electronic tag for displaying graphics and text images and for communicating with other similar tags. Each tag includes a visible, graphical display adapted to be worn by a user. The tag also includes a short range, substantially unidirectional electronic communication channel, such as an infrared transmitter-receiver, located on the display unit so that, when the display unit is worn, the interface faces in a direction of the desired communication with another person who also is wearing a similar tag. This arrangement makes possible automatic data exchange and comparison of the interchanged data and display of the results of the comparison on the tags worn by the two wearers. The tags also have a longer range wireless communication system to receive and transmit data.

Abstract: A wearable electronic tag for displaying graphics and text images and for communicating with other similar tags. Each tag includes a visible, graphical display adapted to be worn by a user. The tag also includes a short range, substantially unidirectional electronic communication channel, such as an infrared transmitter-receiver, located on the display unit so that, when the display unit is worn, the interface faces in a direction of the desired communication with another person who also is wearing a similar tag. This arrangement makes possible automatic data exchange and comparison of the interchanged data and display of the results of the comparison on the tags worn by the two wearers. The tags also have a longer range wireless communication system to receive and transmit data.

Abstract: Among other things, a user of a site is provided access to information associated with a person who has entered, on a shared social network (SN) system controlled independently of the site, a consent to permit information of the person to be accessed by the user at the site. The information is displayed to the user of the site only in accordance with the consent. The consent is effective without requiring any action by the user of the site.

Abstract: Among other things, a user can determine, from aggregated transaction data, private information about a transaction of another party. The other party is associated, in a shared social network database, as a contact with the user. The activity of the other party is related to an activity or contemplated activity of the user. The private information is from a source that is controlled independently of the shared social network database and the aggregated transaction data.

Abstract: Among other things, a user of a site is provided access to information about a person to whom the user has a connection. The connection is stored in a shared social network (SN) system controlled independently of the site. The information is displayed to the user of the site only in accordance with a permission of the person for whom the user has the connection.

Abstract: A wearable electronic tag for displaying graphics and text images and for communicating with other similar tags. Each tag includes a visible, graphical display adapted to be worn by a user. The tag also includes a short range, substantially unidirectional electronic communication channel, such as an infrared transmitter-receiver, located on the display unit so that, when the display unit is worn, the interface faces in a direction of the desired communication with another person who also is wearing a similar tag. This arrangement makes possible automatic data exchange and comparison of the interchanged data and display of the results of the comparison on the tags worn by the two wearers. The tags also have a longer range wireless communication system to receive and transmit data.

Abstract: Through a user interface on a computer, a user is enabled to define questions to be answered by attendees of an event, the answers to the questions being indicative of connections corresponding to pairs of attendees, a computer receives answers to the questions from the attendees through a user interface, and based on the answers, provides information to attendees to facilitate face-to-face interaction between the pairs of attendees. Through a user interface on a computer, a user is enabled to view a graphical device that is representative of a current satisfaction of attendees of an event based on two or more factors associated with satisfaction while the event is occurring.

Abstract: A digital facility is made available from a source to users via an electronic communication medium. At least one of the users is associated with an access permission that enables the user to access at least one of the digital facilities. At least one of the users is associated with a grant permission that enables the user to give to another user a permission with respect at least one of the digital facilities.

Abstract: A wearable electronic tag for displaying graphics and text images and for communicating with other similar tags. Each tag includes a visible, graphical display adapted to be worn by a user. The tag also includes a short range, substantially unidirectional electronic communication channel, such as an infrared transmitter-receiver, located on the display unit so that, when the display unit is worn, the interface faces in a direction of the desired communication with another person who also is wearing a similar tag. This arrangement makes possible automatic data exchange and comparison of the interchanged data and display of the results of the comparison on the tags worn by the two wearers. The tags also have a longer range wireless communication system to receive and transmit data.

Abstract: A wearable electronic tag for displaying graphics and text images and for communicating with other similar tags. Each tag includes a visible, graphical display adapted to be worn by a user. The tag also includes a short range, substantially unidirectional electronic communication channel, such as an infrared transmitter-receiver, located on the display unit so that, when the display unit is worn, the interface faces in a direction of the desired communication with another person who also is wearing a similar tag. This arrangement makes possible automatic data exchange and comparison of the interchanged data and display of the results of the comparison on the tags worn by the two wearers. The tags also have a longer range wireless communication system to receive and transmit data.