The bridges is the way used by the bastards, that utilize the third party viewers to hack accounts. Then I got hacked again and again, till someone pointed out one thing to me, even though I was using the official Second Life viewer 2, I didn't delete the bridges that the third party viewers create on SL on your account in your inventory. I was initially using a third party viewer, Firestorm, but I was not anymore since the first time I got hacked. Lindens did react quickly the first time and a bit amazed the second time. I have an account that has been hacked for the 4th time within 2 months, thank god I took everything off after the second time and got reemboursed for all the real money they tried to steal.