I have it set up to create an account with your facebook credentials so you may also login with your email address. That is why you need to supply a password, because you may login more than one way.

Not necessarily high sensitivity, but if someone would happen to get into your account, they may delete all of your Tags.

The email confirmation is important because the entire service runs on email - when someone finds your Tagged item, TaggedBack sends a email to the owner. If that email is incorrect, they will never be notified. I am unsure how else to do it.

According to my analytics, very few people go to the registration page, but when they do, very few leave without registering.

Thanks for the questions and suggestions, they are much appreciated!

Have you considering demoing the user with a couple of "sample" egistration tags? Like a "Try #4048858 or #832939 in the box below." They wya the user can see A. what the tag numbers look like and B. what entering a tag looks like. Also, I'm willing to bet that almost everyone who logs into your service w/ facebook doesn't want to log in any other way. For FB users you could skip the password and email and simple use FB for signin and send them messages when a tag is entered.

Very cool service btw, I was thinking of something just like this the other day. If, for some reason, you'd like to collaborate with someone on this idea I'd love to help.

Wow, great idea! I will add a sample Tag tomorrow if I have time. I will probably alter the facebook login system soon as well. Thanks for the pointers!