We'll be talking about political blogging. An uneven contest, especially since I'm the - alleged - sceptic in the line-up. And even more especially since I'm not in the least sceptical about blogging ... whatever that would mean.
What I am sceptical about is that blogging or any other form of social networking can fix what's bust about our politics and our political journalism. In fact, it's more likely to make them both worse.
Each new alliance of social media and politics has one or more of these claims made about it;
- it's an attempt to bridge the gap between politicians and the public
- it brings a voice to the conversation that's been marginalised by conventional politics and political journalism
- it enables direct communication between politician and elector without the mediation of broken political journalism
From what I see of the successful political blogs - let's take Iain Dale and Guido Fawkes for instance - they replicate the inward looking, metropolitan chumminess of the Westminster village that many in the audience find repellent in both politics and political journalism. Similarly, I'm left wondering what it is or might be that Benedict Brogan, say, or Daniel Hannan (political journalists both, politician the latter) might say in their blogs that they might not say in their columns, leaders or - in Daniel Hannan's case - addresses to the European Parliament.
It's inevitable, too, that - as Joe Trippi told Jeff Jarvis - politics on social networking sites will become dominated by 'makaka moment' videos ... accentuating rather than countering a similar trend in political reporting.
Crucially, though, no form of social networking bridges the gap that has to be bridged. And that's the one that used to be filled by party organisation that joined the civic conversation to political action - formally in the case of Labour and the Liberal Democrats, informally in the case of the Conservatives. It's fine to have a robust and energetic civic conversation ... but a conversation is exactly what it says it is; talk.
I can see how blogging enables that conversation; I can't see how ideologies are derived from it nor how political judgement and action are derived except in a nervy, fractured obedience to some assessment of 'the public mood'. Which is precisely the problem in the three way relationship between people, politicians and political journalism.
Let's see how Thursday goes.