When you say "transcribe" I'm assuming that you are talking about taking all the threads of the chat and put them in some kind of order, right? You might want to take a look at TwitterFall and put in the chat's hashtag (e.g., #transcribechat). It'll give you the timestamps and comments. I would think that you should be able to copy and paste it into a word document and you'll just have formatting to do, but I'm not 100% sure.

I hope that helps.

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Cheryl Henderson-Khalid
KAFE, LLC