Is this true?

I was reading A to Z SEO (shared here by one of admins) and i find this:
"It is also a good idea to include hyphens (-) between each of the keywords within your domain name. This tells a search engine spider that each word is a separate word, not one continuous word. The search engines which use keywords in the domain name as a part of their ranking formula will not be able to recognize keywords unless they are separated by a hyphen (or a slash or underscore for sub-directories). Search Engines prefer the use of hyphens in domain names because they can produce more accurate search results by being able to recognize specified key words in your URL."

Is this true?
P.S the ebook it's a little bit outdated (2007)

I don`t think it`s true. It doesn`t really matter if you have hyphens or not in the domain name. It`s really important to include your target keyword in the domain name and to try to make it as easy to remember as possible.

It's incorrect, Google can still recognise keywords without slashes, dashes etc. Even in 2007 that wasn't true.

While Google can recognize keywords without -s in them, it's still a good idea to include them so that google knows just exactly what you're going after.

Example: Experts-Exchange.com as a domain makes it clear what the site is about, but run it together as expertsexchange.com and all of a sudden Google may think that the website is about "expert sex change"

Where this is most useful is in blog posts. I wouldn't reccomend buying "blue-widgets.com" if "bluewidgets.com" is available, but I certainly would reccomend using "bluewidgets.com/some-example over bluewidgets.com/someexample

Hope that helps.

Also, there IS a significant difference between - and _

In computer science and programming, and file naming conventions, unix, etc they have very different meanings. It used to be in the past that google would NOT treat _ as a word separator like they did with -.

I wouldn't use _ in URLs if it were avoidable.

TheHockeyGod said:

Also, there IS a significant difference between - and _

In computer science and programming, and file naming conventions, unix, etc they have very different meanings. It used to be in the past that google would NOT treat _ as a word separator like they did with -.

I wouldn't use _ in URLs if it were avoidable.

Click to expand...

Yes agreed, I thought we were just discussing domains, I should have mentioned this .

some domain parking not permitted domain with dash

i don't know why but when i'm talk with my parking manager, she said the domain with dash is not rated

This is false, even in 2007 search engines where able to recognize 2 or more words combined.

Stop reading the e-book.