VVCap is a tool designed to do a single-click screen capture to web.
It is that easy.

You can use VVCap for instant messaging, email, twitter or any other social networking site, when you need to do a "quick-post" of what you see on your screen

Aside from screenshots, VVCap can also capture animated GIFs
Select area on screen then click record button, after recording you will have option to remove unnecessary frames before sending

Users can also upload .gif files to site directly

Every image is encrypted and has unique 11 character mixed case alphanumeric URL.
In order to see that image, one needs to know the URL.

Unless you publish that URL, it is not conceivable to see it by mistake or by guessing.