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eBay- Username policy
Your username is the unique name that you use to identify yourself on eBay, like SuperSeller or Nothing_but_Posters. When you register, you should choose a username that you like and will remember. Use your imagination, but keep in mind that there are a few rules you need to follow. Remember that usernames:
There are also a few formatting guidelines you need to follow. For more specific information and examples of what is and is not allowed, please take a look at the guidelines below.
Make sure you follow these guidelines. If you don't, you may be subject to a range of actions, including limits of your buying and selling privileges and suspension of your account.
If you see a username on the site that you think violates this policy, report it.
If you're having trouble signing in to eBay or can't remember your username or password, get help.
What are the guidelines?
You can only change your username once in a 30-day period. This is to prevent confusion for other eBay members as well as potential fraud. Keep in mind that your username is a valuable asset on eBay, like your Feedback score. Buyers and sellers will recognize you by your username, so it's a good idea to choose one that you'll want to use for the long term.
Information for members whose current username is—or represents—an email address or web address (URL): If you have a current eBay username registered after November 2001 that is also an email address, a web address (URL), or is a look-alike for either, you must change your username to comply with this policy.
We want all our members to choose a username they like, but we don't allow members to choose a username that might be offensive to others, might violate a copyright or trademark, or might mislead or confuse other members.
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