I love Polyvore to better manage my wardrobe. Since I joined, I have only favs in my closet!
You will recognize many H&M items in my closet. That's why (1) due to lack of time, I do online shopping only; (2) H&M has pretty good online shop allowing to clip items to Polyvore and check out before the purchase whether they can be combined with existing wardrobe; (3) if I order with H&M, items immediately suit my size - H&M has excellent cutting.