Abstract: A method and apparatus for using an application layer demarcation point are described. In one embodiment, the method comprises monitoring end-to-end performance of a network application at an application demarcation point in a network, and mediating between provider infrastructure and customer infrastructure based on results of monitoring.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for providing advertisements. In one aspect, a method includes receiving a request for an advertisement from a user device associated with a first user, and identifying advertisements responsive to the request. A determination is made that one of the advertisements describes a good or service that is associated with an endorsement provided by an endorser, and the endorser is recommended by a second user that belongs to a same social network as the first user. The advertisements are ranked based on one or more signals associated with each advertisement, wherein one of the signals for the one advertisement is the endorsement and is used in the ranking in response to the determination. The ranked advertisements are provided in response to the request.

Abstract: A method and apparatus for using an application layer demarcation point are described. In one embodiment, the method comprises monitoring end-to-end performance of a network application at an application demarcation point in a network, and mediating between provider infrastructure and customer infrastructure based on results of monitoring.

Abstract: A method and apparatus for using an application layer demarcation point are described. In one embodiment, the method comprises monitoring end-to-end performance of a network application at an application demarcation point in a network, and mediating between provider infrastructure and customer infrastructure based on results of monitoring.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for providing compensation. In one aspect, a method includes receiving a request for an advertisement, and identifying an advertisement responsive to the request, wherein a good or service associated with the advertisement is associated with an endorsement provided by an endorser. The advertisement is provided in response to the request. An indication of a selection of the advertisement is received, and compensation is provided to the endorser upon receiving the indication of the selection of the advertisement.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for providing advertisements. In one aspect, a method includes receiving a request for an advertisement from a user device associated with a first user, and identifying advertisements responsive to the request. A determination is made that one of the advertisements describes a good or service that is associated with an endorsement provided by an endorser, and the endorser is recommended by a second user that belongs to a same social network as the first user. The advertisements are ranked based on one or more signals associated with each advertisement, wherein one of the signals for the one advertisement is the endorsement and is used in the ranking in response to the determination. The ranked advertisements are provided in response to the request.

Abstract: A method and apparatus for using an application layer demarcation point are described. In one embodiment, the method comprises monitoring end-to-end performance of a network application at an application demarcation point in a network, and mediating between provider infrastructure and customer infrastructure based on results of monitoring.

Abstract: A method and apparatus for using an application layer demarcation point are described. In one embodiment, the method comprises monitoring end-to-end performance of a network application at an application demarcation point in a network, and mediating between provider infrastructure and customer infrastructure based on results of monitoring.

Abstract: A method and apparatus for using an application layer demarcation point are described. In one embodiment, the method comprises monitoring end-to-end performance of a network application at an application demarcation point in a network, and mediating between provider infrastructure and customer infrastructure based on results of monitoring.

Abstract: As many as three of the four heads spaced at 90.degree. intervals around the periphery of a head wheel may be in contact with the magnetic tape of a video recorder and reproducer at the same time. Oblique tracks are recorded on the tape record video date in blocks corresponding to sectors, each composed of the same numbers of lines, each track beginning with a video sector and ending with another video sector with small audio blocks inbetween. Four different sector designations succeed each other in turn. The video data of each block is preceded by an identification signal of which the two most significant bits designate the sector. The sector designations are separated from the outputs of each of the magnetic heads and control a PROM, the output of which controls a crosspoint switch to direct data blocks in accordance with the sector identification to four memories and the audio blocks to an audio memory.