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Hi April,
Thanks for your interest.
So far we don't have such blog application integrated with jomsocial or Jomsocial don't have such feature.
But our related concern would love to hear such feature at
uservoice.jomsocial.com/forums/101561-feature-request
I would suggest you to discuss there (if you like to).
There are some other blog extension like K2 which can serve your purpose.
Thanks