You can upload to 7DayPic.com using any of these apps
iOS (iPhone/iPad/iPod touch)
Official Twitter app (Free)
Get it at http://itunes.apple.com/us/app/twitter/id333903271
Instructions: Go to Settings, Services, Image service, Custom and enter:
then click Save.
Step by step instructions and screenshots at: http://blog.7daypic.com/post/4954431813/here-are-some-step-by-step-instr...