This is easy and convenient in many ways, but it means that anyone who knows your membername could send you email. So ask yourself how you feel about ever getting email from new folks you don't know. If that idea bothers you, we recommend choosing to display a nickname on your page and selecting not to display your email address. A nickname is a new name you choose that is different from your membername, so it gives no clue to your email address. Of course this is entirely up to your personal preferences.
Many people enjoy the combination of anonymity and participation the web offers.
For example, you might fully participate in an online community as NetGrandma, your membername. You could have lots of fun meeting people online and sharing your interest in collecting eggcups. But no one would know that you are Jane Levy from Marblehead, Mass., unless you tell them. We simply recommend thinking through how much the information you publish really tells someone about who you are. As is true in the rest of life, a little common sense goes a long way.