Don't Send Risque Photos. Just Don't!
Beware, there is a new app that can grab those "Snapchat" pictures you think you are sending and they are getting erased. I think the best rule of thumb is to never take or send a photograph that you don't care if it's out there for the world to see. There are too many ways for someome to intercept those images for their own use and you have no control over what happens to them. The app is called Snaphack. It is in no way affiliated with Snapchat, the cost is $.99 and you will have no way of knowing the photo was opened, screenshot or hacked. Normally snapchat will let the sender know if the recipient tries to screenshot the picture. In this case because it is a 3rd party app, snapchat has no way of knowing it was opened or grabbed. So just don't send risque photos and you won't have to worry about it.
How to Browse and Keep Your Findings Undetected
The Android app Orbot lets you browse the web anonymously on your phone all the while blocking advertisers and networks from gathering information about you based on your mobile web browsing history. For you iPhone users there is Onion Browser.
Google is Going to Use your Name and Photo
Google shared endorsements are headed this way. If you have ever +1'd a page or reviewed a Google app, you may wind up on a Google product or service advertisement. Sound familiar? Facebook tried to do this and it made quite a stir. Currently the Facebook version of this is still in limbo. Google however will be doing this starting November 11th. If you don't want to be part of their advertising you can change a privacy setting ahead of time.
Hope this helps keep your info private!