Diary: Pick of the week - Agency Republic/O2

Larissa Vince is impressed by Agency Republic's "The battle for the UK's favourite university" Facebook group, created for O2:

"This is a great example of the kind of creativity that works online. The page isn't particularly pretty, there's no film at all (apart from what the university students have uploaded), but at time of going to press, more than 82,000 people have joined the group, uploading their photos, videos and comments in a bid to win an O2-branded party. A great idea that works."