The subjectivity and non-probability based nature of unit selection (., selecting people, cases/organisations, etc.) in purposive sampling means that it can be difficult to defend the representativeness of the sample. In other words, it can be difficult to convince the reader that the judgement you used to select units to study was appropriate. For this reason, it can also be difficult to convince the reader that research using purposive sampling achieved theoretical/analytic/logical generalisation . After all, if different units had been selected, would the results and any generalisations have been the same?
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Social networks (Facebook, Orkut, MySpace, Bebo, LinkedIn) are not only changing the way that many people use the Internet, but they are also presenting marketing practitioners with new challenges when trying to reach and acquire customers online. At the same time, these social networks have their own challenges in trying to acquire and retain customers when many of the traditional principles of consumer behaviour no longer apply. As social networks become more popular, a marketing dissertation in this area would be up to date and in line with current trends.