ImageShareIt is a freeware from PCWinSoft and drag, drop and share is what it is all about.
ImageShareIt requires you to have an account. This was a change recently added to the software. The registration page is at ImageShareIt registration page
Registering an account is 100% free: ImageShareIt is freeware all the ways.
After you register yourself you will receive an e-mail on the e-mail account provided at registration and all you have to do is click the validation link inside the body of this e-mail.
After your account is validated then you can login to ImageShareIt and drag, drop and share your images and photos.
It is all free and you no longer need to browse for images through folders to upload pictures to share on Facebook and other social networks, the process is drag, drop and share just like that.
Watch the video demonstration bellow to understand what I am talking about.