What's the easiest way being really spontaneous?

Got some time and want to make the best out of it? Sick of wasting time asking friends if they are available and discussing about the venue? Most people love being spontaneous but are rather helpless when trying to be. What are you missing to be spontaneous? Sure, information about who's available at that particular moment and what amazing activity could be done where (without an information overflow that usually keeps us off from being really spontaneous)!

What do you think that is needed? Any hint is appreciated. And if you want to follow our approach - where your ideas might be elaborated - we're working on IveTime... you'll find it ;)