Why does South Park and Canadian shows use actual names for stuff?

[Toughwood067]

Shows like iCarly or Wizards of Waverly Place use fake names for stuff like Facebook or iPods, like PearPhones and stuff, but I noticed a Canadian show actually used the name YouTube and iPod. It was a show on Disney called My Babysitters' a vampire.

south park also uses real names...like Facebook.

why?

[T68]

South Park is show that heavily uses parody as a comedic device. They don't care about licensing and advertising on the show for particular products.
iCarly or Wizards is a corporate Disney venture who would not pay to promote products that aren't theirs.