There have been a magnitude of SEO / SEM strategies come and go in the last 15 years. Some were so easy to implement that everyone implemented them to the extreme. Then the search engines devalued those strategies and marketing sleuths discovered more. Having a strong presence in a variety of places on the web was and is one technique. When done well, this can bring you rewards, but we are still seeing abuse.
You may be sabotaging your business without even realizing it by leaving duplicate content across the web.
Why is that important?
If you have ever seen the movie Multiplicity © (1996 by Columbia/Tri-Star) with Michael Keaton as Doug Kinney who cloned himself.
Andie MacDowell played his confused wife. You may recall it became more difficult to know which was the original Doug. Which clone gets the credit for the good deeds or the bad ones? His trust factor went down and his integrity was seriously compromised.