can i look up blogs by user name?
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I believe so, put it in parentheses.
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you can search this sites
654031
It depends upon which single site you are on.  Most sites have a browse or a search section listed with other options on the site.  Near the home section or sign in/register.  You need to know the profile name though.  If you don't know the headline or username, u will have to find them the old fashioned way by entering in their stats and searching that way.
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try http://www.blognri.com/
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On the Yahoo MAin Page, there's an option to look up yahoo members, you can type in that name and see...
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search for item specific sites
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Just close the little dialog box that asks for your user name by clicking the x in the upper right corner. It will go away and you can see the site.
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look on ask jeeves! If you hadn't tried it aready!
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Search it via Hi5, Match.com, or even Blogger!
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www.yahoo.com. There's a link in the upper left hand corner of my browser. I'd look there first, then type in the name if it weren't.
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Searching for domain name owners is called a "whois" search in Internet parlance.\n\nGo to the "Whois" link below and enter the domain name of interest there.
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www.authortracker.com and out in the author's name...
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can google there name  should find  them
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try it on https://namesdatabase.com/
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blogger.com from google. Take a look at my blogsite once you're there....www.gogetbananas.blogspot.com ;)
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Try names database . com
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If you look on Yahoo 360, there is a thing called a blog roll. It is a list of suggested websites by that person. I have found some really great websites this way.