New methods are key to developing new hypotheses and testing old ones. It would be difficult to imagine social sciences today without regression models, or social network analysis, or online ethnographies. Each has been developed and used to expand what we think that we know about the social world.
But social scientists, especially junior researchers, too often fail to justify their new methods. They demonstrate their creativity and document the often considerable work they put into developing their new approach. But scholars should take care that they're not just building a better mousetrap.