Although this URL does resolve to the popular News/Discussion site Slashdot, as do all of [www.]slashdot.{com|org|net}, this is not the "true" Slashdot URL.
The One True Slashdot is http://slashdot.org. The domain name was picked because it leads to the pronunciation "haitch tee tee pee colon slash slash slash dot dot org", which is not nearly as difficult to say with the "www" thrown in there.