Log In with Your Facebook Username
A couple of months ago, facebook made it easier for people to find and connect with each other by using Facebook usernames. Beginning today, facebook users will also be able to log in to their Facebook account with their usernames. from any Web browser, mobile phone or Facebook Connect-enabled website.
For example, I can enter my username, "pradeepkandel," in place of my email address when I log in to Facebook.
Meantime, we will still be able to log in with our email addresses. So, without doubt, this is simply a more convenient way to access our Facebook account. A username gives us an easy-to-remember web address for our Facebook profile so our friends can more easily find and connect with us.
In case, you still don't have a Facebook username, you can choose one here.