USB drives are great devices to use. And we suggest that you use them all of the time. But you have to be very careful with them. You cannot just put them anywhere and forget them.
You cannot always believe what your eyes tell you. You have to check around and make sure that everything is okay before you fully commit to using a service. You have to make sure you have the right link, the right graphics, and the right web address before you should feel safe on a site.