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Chapter1
Web2.0Revolution
InthischapterweintroducethereaderintotheworldofWeb2.0.InSec-
tion1.1weinformallydefineWeb2.0andwediscussmainrulesforWeb2.0
applications,explaininghowthisnotionrevolutionizesmodernsoftwarede-
velopment.WeconcentrateondistinctfeaturesthatdifferentiateWeb2.0
fromprevioussoftwaredevelopmentparadigmsandwedemonstratehow
changesinducedbyWeb2.0affectthedatageneratedbysocialapplica-
tions.Inparticular,inSection1.2wedescribeaninterestingswitchfrom
thepullarchitecturetothepusharchitectureofinformationtransfer.This
switchbearsconsiderableconsequencesfortheresearchpresentedinthe
dissertation.Next,weproceedtothepresentationofthemaindomainscov-
eredbythedissertation.InSection1.3wedescribeblogs,whichareanew
formofexpression,andweinvestigatehowblogschangethewayinwhich
informationisgathered,disseminated,andpublished.Section1.4isdevoted
toInternetforums,whichareanewformofconversation.Wedescribethe
natureofInternetforumsanduniquecharacteristicsofthiscommunication
medium.InSection1.5weturnourattentiontoanewformofeconomicac-
tivity,namely,toonlineauctions,andweshowhowtheemergenceofahuge
customer-to-customermarkethasshatteredthetraditionalretailindustry.
Section1.6examinestheemergenceofanewtypeofdataflowproduced
bymobileobjects.Weoutlinemainchallengesinanalyzingsuchdataand
discussitssocialaspects.Finally,Section1.7containsabriefintroductionto
dataminingandknowledgediscovery.Itsomehowdigressesfromthepreced-
ingsections,butitisnecessaryasthepreliminarytofuturediscussion.The
chapterconcludesinSection1.8,wherethemainthesisofthedissertation
isformulated.
1.1
WhatisWeb2.0?
ThetermWeb2.0hasbeencoinedbyTimO?Reillyin2004duringthefirst
O?ReillyMediaWeb2.0conference.AccordingtoO?Reilly[98]
