Web 2.0 Articles used on multiple platforms?

Is it ok to use the same articles on multiple web 2.0 properties. I ask as i outsourced some seo from freelancer and when he sent me the reports i checked a few of the web 2.0 and he used the same articles on multiple sites.

I asked him if this was ok and he said "they are not in BULK, thats why we are safe, don’t worry"

Is this strategy ok . Cheers guys