Mark Zuckerberg just announced via his Facebook page that Facebook has achieved an amazing milestone: 1 Billion users.

We’re delighted to be a preferred marketing developer (PMD) and working with some members of the team that Facebook has established and we’re looking forward to the next 1 Billion.

As it happens, we had a panel discussion last week on just this topic for Social Media Week here in London: Facebook 1 Billion: End of the Beginning or Beginning of the End?

You can catch up on that discussion here, featuring Ian Maude from Enders Analysis, Dan Head from Salesforce and our own John Armah – debating what the 1 Billion milestone means for Facebook.