Leaf.ly allows users to find their optimal strains of marijuana with impressive specificity (rankings of the best bud for “creating art” or producing a “giggly” feeling are just a click away!). Members can then share their findings and experiences with others in the community, as well as collect Foursquare-esque badges for completing different pot-themed tasks and activities … if they can remember having completed them afterward, that is. [Kottke]