Did you know your IM conversations are stored in your computer? Of course you did, that's why you turned that feature off, right? If you want more privacy, and just want to make sure your dirty notes aren't being stored, you should check out Bigstring's self-destructing instant messaging. The company just released this new IM client, that will soon be compatible with your IM client of choice in the future. Find out what Bigstring told us about this new service in the video below: