A photojournalist tired of seeing people steal his work has created a watermark app for the iPhone. The app, called Marksta, can be downloaded from the App Store (currently for free).

As our social media habits become more and more mobile, the app is a great way to protect your photos on those sites. Or to promote your business. 

Here are a couple examples of what you can do with the app:

The app lets you add text anywhere on your photos, using different colors, transparency and fonts. You can even add a watermark as a border.