"Professional blogs are excellent [information hubs, and] sources of secondary or tertiary information. Most information (apart from occasional extensive discussions of topics) can be easily found elsewhere, but these blogs concentrate and filter it, and they can be viewed as one-stop information kiosks or information hubs. The postings are based mainly on information appearing in other weblogs, news items and press releases. Often, in addition to pointing to information sources, the bloggers provide commentary and express their opinion on the issues at hand."
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