With Twitter’s ubiquity across the 10,000+ attendee conference, we found the spontaneous creation of session-, speech- and shindig-specific hashtags to be among SXSWi 09′s greatest takeaways. The sheer volume of Tweets coming out of the festival rendered the dedicated #SXSW tag all but useless, so attendees and panelists quickly created the DIY hack of hatching hashtags specific to individual talks at the start of many sessions. From #webfem and #hotttsex to #free, the tags helped those interested in specific sessions but who couldn’t attend — whether they were in a different panel across the Austin Convention Center, or across the country — stay abreast of sessions and topics that interested them.

She also recounts what sounds like a fiery panel between Alltop creator Guy Kawasaki and Wired‘s Chris Anderson. You can read the exchange and more of Rebecca’s takeaway here.

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