This is one of the guidelines in wikinomics

In wikinomics, a user page can be used to self promote. Other pages in wikinomics are to be edited to conform with the "community interest". Sometimes it is definitely appropriate to link to an outside site, product or service. Such examples however, need to be subject to Neutral Point of View - and be reviewed objectively (by all participants). "Marketing speak" should be avoided or edited out.