I’ve said before that one of my favourite tricks in developing new products is simply to break one rule – take a successful formula and change just one thing.

Instagr.am does just that – it’s the Twitter model of easy microblogging, but based around photos rather than text and it seems to be catching fire by enabling people to broadcast their creativity to friends and strangers in a fast and customisable way.

There’s a need for this. Whereas Facebook’s blithely happy environment pulls towards the mainstream, emerging services such as Instagr.am skew towards the thoughtful and creative. And there’s a place for that.