Not really - the users own the posts and put them up in order to get publicity. It's like claiming 'I republished your classified ad for you in 6 papers' is a problem - virtually every classified ad would be pleased that they had more coverage.
I don't want my classified ads republished because I've chosen to publish the advertisement in places that target specific types of people.
It's incredibly naive to assume you know best.
We have our job ads republished by job sites with user bases that are far outside what we're interested in, and it results in a massive waste of our time in filtering those candidates.