Each member's tip and reason for tipping are shared with the community within the Tip Feed. If you wish, you can make this information private.
After you make a tip to your savings Tip Jar, you will be prompted to share your reason for tipping. At this step, you can set to make your reason private by tapping on the Public button at the bottom of the screen and set it to Private mode. This will make all of your future tips and reason for tipping, across all Tip Jars, private.