Instead of abandoning the registration, maybe it could be streamlined to make it easier for the user. In many cases it would be enough to just ask for user's e

Instead of abandoning the registration, maybe it could be streamlined to make it easier for the user. In many cases it would be enough to just ask for user's email address. Giving just some email address would allow me in to service and I could start using it. On the background the system would send me the standard welcome message via email, but that would not require any immediate action from my behalf. If I decided to become a regular user, I could then setup my password on the service. Maybe the system could point out in the UI that I'm not yet fully registered. In case I forgot the whole thing and tried to use the same email to log on the service next week, the service would remind me that this email is already in use and ask me to go through the verification process to setup a password.