Hello everybody, i would like to use sef parameters to show only th user's name after the site name exple: site.com/user1, site.com/user2. This will give opportunity to my customers to have their website address. Thanks

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I'm afraid I don't know much about SEO but you could check the K2 Parameters in the Advanced tab under the Advanced SEF Settings and sh404SEF Integration if you use any.

If you don't use sh404SEF maybe you could try it as well and see if it works for you.