There's nothing wrong with this. In fact it is very common to use an email address for a login. If you feel members will have a privacy issue allow them to choose a display name once they register. Then whenever they are active or participate in your site the display name is what is shown to the world.
Someone is helping me to completed my site so i really don't want to add more work.
My site is Job board site and i will not have Forum in my site.
What is your advice SnakEyez02 ......
thanks for your advice...i like to asked stupid question then i learned something