Per WordPress TOS & Copyright Advertisement, Adsense, Yahoo, Chitika, TextLinkAds and other ads are NOT allowed on free WordPress.com blogs.
Some of the options available for including Advertisements (Ads) on free WordPress Blog sites are:
- They have a feature called Ad Control that lets WordPress.com bloggers with a lot of traffic (generally 25,000 pageviews/month or more) and appropriate content turn on AdSense and Skimlinks for their blog and split the resulting revenues 50/50 with us. If you’d like to apply to try Ad Control, please use the form below to send us a message.
- You can run any ads you’d like if you manage your own WordPress installation. More info, including hosting recommendations, can be found at get.wp.com.
- VIP blogs are permitted to run ads.
If you are in any doubt, please contact support for clarification.
Source: TOS & Copyright Advertisement
Reference: Ads on free wordpress.com site
