With your privacy under attack by so many organizations, and governments; it is important to remember that anything you share can come back to haunt you. Facebook recently changed its privacy policies to include a statement that anything you post (be it pictures, posts, stories, poems, status updates, etc…) is owned by Facebook, and can be used as they please because all users are capital entities.
I also just read about an iPhone/iPad app called “snapchat” that purports to automatically delete pictures sent after a max of 10 seconds since it was received. This is done in an effort to protect teens from “accidently” sharing photos of themselves that could cause trouble for them (think the Amanda Todd incident) however, there is nothing stopping anyone from taking a screenshot of the picture or even doing a few other ways of capturing the content before it is auto deleted.
It is important to stay educated when sharing anything online, as once it has been released in a digital format, there will ALWAYS be a trace of it somewhere on the internet. The only way to truly protect your pictures, or information is to keep it off the web to begin with.
If you are worried about maintaining your copyright for your works that you post online, make sure you carefully read ALL the privacy and content notices under the end user license agreements for any company or website that you use. In a best case scenario you would be using your own private server, and private storage that would allow you to maintain ownership of all your intellectual property.
Privacy and intellectual property is a huge concern in today’s world. Governments, and companies will seek to profit and use your information for their gain, and most times with little concern for how it impacts you.