Aggregators Barriers Privacy Policies Twitter 
Buzz Marketing for Technology
JUNE 27, 2008
5 Current Barriers. Personal Learning Environments (PLEs) refer to the aggregation of single-functionality tools which enable learners greater control over their own learning experience. IM Persistent Presence tools (such as Twitter and Jaiku. Amazon S3 Aggregating Content. Aggregating People. 1 Overview.
Hubspot
FEBRUARY 28, 2012
Perhaps one of the biggest barriers to brands opening up their social media accounts to customer service is the mixed messages to fans and followers. See that first Twitter account? It's called 'ASOS Here to Help,' and it was set up as an entirely separate entity from ASOS' "marketing" Twitter account -- the second image shown above.
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