Update: Q&A now added to the playlist and video below.

It's becoming clear from all the feedback, blogs and tweets that Twitter's Biz Stone pulled the biggest crowd with a jam-packed auditorium at the Cannes Lions festival Monday.

We're in the process of making all of the seminar available to watch online and here's the first part, Biz's opening speech talking about how Twitter came into being, how it has grown and developed, how individuals and organisations have harnessed it, and what the future holds.

To follow we'll have Biz's answers to the questions that were tweeted in advance and during the session.

The always thought-provoking Karen McGrane argued recently why "Web ads suck", She cites a litany of usual suspects: lack of investment compared to other channels, questionable measurement, size and technical constraints and, most interestingly from my perspective, the fact that advertising should be "about more than awareness". As a career PR professional, this last point caught my attention - particularly her citation of Bob Greenberg of R/GA in Art & Commerce: Funnel Clouding:

... Real engagement requires entirely new teams of people—like information architects, data analysts and an army of technologists of various stripes. The traditional teams found at agencies simply do not possess the skill sets needed to tackle areas that are deeper inside the funnel, where purchase decisions increasingly take place.

She complements this by suggesting:

You get flashy, glossy microsites because you’re dealing with an industry of advertisers and publishers that haven’t had a chance to develop and assimilate a new set of values.

While we may be coming at this from slightly different tangents, the point itself is valid. As consumer expectations change with respect to interaction, transparency, and as they look for ways to engage more meaningfully with brands, new types of expertise will be required at the table - to drive forward the opportunities as well as to manage the risks. Moreover, and where this debate seems to end at the purchase decision, increasingly brands must now consider what happens post-purchase - to encourage evangelism, to address issues, to build community and loyalty, and to deliver a "sustained" brand experience.

If advertisers can't do it. Who will?

Eric Jackson in Business Week last week accused Twitter of a lack of innovation. A self-proclaimed huge fan of Twitter, he writes:

"...I have grown baffled and annoyed at one of Twitter's greater non accomplishments: Since I've been using the service, its functionality and offerings have barely improved."

So far so good but then Eric continues:

" ...I understand that part of Twitter's power is its simplicity. But there are still no ads, search isn't easily customizable or useful, and there's been no evident push into location-based services despite the talk.."

What, no ads? I am shocked... no I am not, I am delighted.

Hopefully this is one question that Biz can answer at the First Annual Cannes Lions Tweet Up.

If you want to ask a question yourself, please follow @hillandknowlton on Twitter and the #hkcannes hashtag for information on how to do so next week.