[Corpora-List] subjectivity classification corpus?

[Octavio Sanchez]

Dear all,
I am looking for a corpus for subjectivity classification at sentence 
level, i.e. I need a corpus with sentences labeled as objectivity or 
subjectivity.
I have found the corpus of movie reviews for this purpose and the MPQA, 
but I am looking for one based on forums documents or in blogs, do you 
know if there is any?

Best regards,
Octavio.

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