You can now get a lot of choices for your domain suffix. It includes all these listed. The dot com is the leader and is what web pages in Google default to.
Dot net and dot org are next.
However there are popular extensions like dot me is very popular. I have eCollege.me as one of my sites. Be aware too that you can write your domain name in capital letters so I can have BloggersOfTheWorldUnite.com
Dot co is also popular and I have cyberculture.co because all the main domains had been cybersquatted.
So you have a lot of choices. It is still not so easy to get short names tho I have Oknp.net OK No Problem! A four letter domain is a treasure.
So get your domain here :
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