This excercise did help me with my english, specially with the vocabulary and the explanation of topics. I learned to replace the words when I don't know how express me. And I enjoyed the topics of the blog session's, above all those related with my career and with my musical likes.
The "pros" of blogging in the english class are that it's a training of the hand and the brain, and is a exercise like a monologue, where a dialogue with myself. Then, we can edit the errors. The "cons" are that neglected the speaking and listening part of english.