2007 Digital Asset Management Press Web 2.0 
Online Marketing Institute
JUNE 15, 2009
Online Marketing Blog TopRank’s internet marketing blog on the intersection of digital PR, social and search engine marketing. That’s great, but what does it have to do with search marketing? Don’t send a regular pitch with a press release to a blogger. That’s what AdRants is for.
Buzz Marketing for Technology
JUNE 27, 2008
At the time of writing this introduction (August 2006), no particular product or service exists that can definitively be categorised as a PLE, although some prototypical work is in progress. Only a handful of articles have appeared in the academic and public press about PLEs since the term gained currency in 2004.
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