Oh there is. Or would you place a list with all your transactions at the door of your flat so that everyone can read everywhere where you sent money to or received money from? Allowing that different bitcoin addresses are connectable leads to you letting everyone know where you are involved. If you tipped some cammodels, you took part in ponzies or whatever. It could be seen relatively easy.

Check out walletexplorer.com. They try to find out which addresses belong to which website and wallet. Maybe you already can find more about you than you thought.