"Next time you're in town come and look us up", said David Cameron, the British prime minister, to Mark Zuckerberg, the CEO of Facebook, as he finished a conference call over Skype.

In what has to be one of the strangest videos to come out of Number 10 and then publicly posted on YouTube for all to see, the government is showing that they are trying to empower sites like Facebook to help them save money, cut costs and engage with the voting public.

According to the government, the two were discussing how Facebook can support the Treasury's Spending Challenge by providing a dedicated space for Facebook users to come up with ideas on how to make savings in public spending.

It's an interesting idea, but we can't help thinking that Zuckerberg doesn't really seem that interested; either by his chance to have a second chat with the PM in as many months, or on the idea.

While the first 20 seconds sees Zuckerberg looking like a tiger ready to pounce, he soon falls foul of the usual video calling distractions with his eyes clearly showing that something more interesting was going on elsewhere on the screen.

What was he reading on his Mac? Was it another chat with a friend? Or maybe instructions on how to respond? Either way a minute and a half later it happens again, while Cameron talks on in this rather weird video.

The least he could do would be to give the PM his full attention, no?

What do you think was happening on Zuckerberg's screen? Let us know in the comments below.