One of the biggest fears I read from people is regarding photo stream. IOS5 introduces Photostream to iCloud.
If turned on on your iPhone, it will keep your photos on the “iCloud” for a period of time (3 months I think) or up to 1000 pictures, allowing them to sync to your phone, iPad, iPod, mac, etc.
But what happens when you take that ill advised inappropriate picture or 25 pictures of your toes. You probably don’t want those hanging around in the cloud or on your device forever.
Luckily, iCloud has a web interface (https://www.icloud.com/#) and once logged in, you can click on your name to enable settings, click on advanced, and clear your Photostream cache.
Hope this tip works for you!

Reset Photo Stream