Ben ZimmermanCS2650: Distributed Multimedia Systems
Fall 2010
Major Social NetworksFacebookYoutubeMySpaceLinkedIn (career-based)Foursquare (location-based)Latitude (location-based)
The FacebookStarted in 2004Aimed at college students
Required a .edu email accountHad “segregated” networks for each schoolPhoto-sharing and taggingCould specify your residence hall, class
schedule
Facebook 2.0 (2008-09)Became the social network for everyone to be
apart ofAddition of geographically-related networks
Privacy settings related to your network memberships
“Network X can see attribute Y about me”The Status Update incorporated
Similar to what Twitter was already doing for years
Facebook 3.0 (2010)Privacy controls no longer related to
networksPrivacy is controlled on granularity of
friends, friends-of-friends, family, co-workers, regardless of what networks they belong to“Friends can see my wall posts”“Family members cannot view this photo
album”
Targeted AdvertisingFacebook has always been free for its users
to accessSupported by ad revenueThe wealth of personal info like interests in
movies, music, books allows for effective advertising
As Facebook aimed to generate more revenue privacy changes occurred to allow greater access for outside vendors to information
Changes in Facebook’s Default Privacy Settingshttp://mattmckeon.com/facebook-privacy/
Information Revelation
Source:Gross, Ralph & Alessandro Acquisti. “Information Revelation and Privacy in Online Social Networks”
Privacy Implications
Source: Gross, Ralph & Alessandro Acquisti. “Information Revelation and Privacy in Online Social Networks”
• Real-world location “check-ins” are becoming increasingly used in networks
Social Networks as SISNatural slow intelligence systemsConsists of two entities/groups, each with
own SIS characteristicsThe SN as a businessThe Users of the SN for interaction with peers
Currently, heavy focus on privacy due to wealth of personal information about each user
EnumerationThe SN: as a business, considers ways of
changing its features to attract revenueIn the past, geared towards targeted
advertising which required mining users’ personal data
The users: have choices such as continuing to use, reducing usage, leaving, increasing usage, changing privacy settings (if available)Mainly due to the changes in privacy that will
occur
ConcentrationSN: decides to implement one of the
strategies considered in the enumeration phase
Users: decide what their behavior will be in the future because of their preferences to privacy
AdaptationSN: implements the features it decided on
This is where a complimentary cycle begins of considering how the users react to the changes
Users: react to the changes according to their preferences by either altering their online habits or changing settings or information available
PropagationSN: makes users aware of changes via
updates to the EULAUsers: voice their opinions within the
network itself (as well as other mediums) with the possibility of changing others opinions by doing so
EliminationSN: decides to not pursue/consider certain
options in the future. May also be elimination of features/control for
usersConsider it a changing of business policies
Users: some leave the network, or become very infrequent users
Network Petri Net
User Petri Net
Prototype Model
Refined Model
Additions to Refined ModelSinks for business policies, users, and user
behaviorsCapacity of 1 set for all SIS components
(Enumerator, Concentrator, etc.)