From Social Media Today:

20% of tweets about brands is the results of a Penn State study in the States.

Researchers led by Jim Jansen, associate professor of information science and technology, and Twitter chief scientist Abdur Chowdhury looked at half a million tweets. 20% of them were apparently people ‘asking and providing’ product information. Assuming three million tweets a day, that would translate into 600k posts daily of direct relevance to brands.

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