is anyone marketing or having luck with different PR and traffic when using hostname with your domain. such as: travel.abc.com cooking.abc.com hotels.abc.com home-repair.abc.com anyone doing this, getting different PR per site, specific targeted adsense ads, or is google/PR and other stats only built off the domain name and not sub-domain? any input appreciated. (I don't abc.com, only an example)
Google will treat sub domains as different domain for PR, direct linking, adsense. If you'r site is authoritative in Google's eye, it is better to setup as different subdmain but each one should have distinct theme