Are USB (MEMORY STICKS) waterproof ???

No not usualy. They can take some water, but not dunking. I have had this happen to my brother and it no longer worked.

No, they are not waterproof. If one gets wet in the rain you should be fine, but don't bring it into a swimming pool with you. You should do your best to keep it dry at all times.

I would certainly not recommend trying to use any wet component on a computer. If the USB stick has got wet then you could try using it once it has dried out thouroughly, but make sure that it is totally dry before connecting it to the port.

no, they were not water proof.. if they got wet don't use them i will create electric current n can be harmful to your computer

i think the manufacturer never commit on water proof, but i heard my friend said he forgot to take out the thumb drive when he put his cloth in washing machine. after wash, he take out the thumb drive and put under hot sun, after few hours ,the usb drive work fine. try it yourself.

I wouldn't suggest trying it. I don't think they could hold up to complete submersion unless the manufactured had specificaly stated that one could. Just getting a few sprinkles on one, especially if it has a cap on the connector probably would be O'K. One might survive getting wet but only if completely dried out before being used and even then there might be a corrosion problem if it is just left to dry over a long period of time. If you have one that got wet you could try drying it with some kind of air blower that is not hot and that does not get things cold. The last one would be like a compressed air can that is used to blow dust off of keyboards and computers and should always be done far enough away and quick enough to not get anything too cold which would also go for the USB stick.