Facebook gave a very interesting presentation in Barcelona. Building on their recent announcement of 100m mobile users FB are very bullish about mobile ( they want billions of people using their service) and it’s well worth taking 15 minutes to watch this video.

Some of the key elements were around how FB have worked with operators to drive usage – from zero pricing Facebook for a week on Vodafone UK, which drove a huge spike in usage and resulted in 20% more people paying the data charges to continue to get access. They are now producing a text only version called Facebook Zero which operators can give away and use as a way to encourage transition to a paid service.

They also talk about using Facebook Connect as part of the DNA of the device – with clear desire to build an OEM relationship with handset manufacturers as well as operate as an app and part of the OS. They are also testing fanning by SMS in the US. Techcrunch have a good summary which is worth reading.