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Shared hosting can be great economically, particularly a provider that allows hosting of unlimited domains.  I used to think one of the beauties of shared hosting was also that you could have a bizillion sub-domains and WordPress instances for free.  Then I learned that you also need to keep them all up to date.

It’s called cross-contamination and Sucrui has a good article about it.

I recommend the Sucuri scanner.  It identified a very subtle problem that was plaguing my site. Fortunately I found the problem before Google had blacklisted me or the embedded content had polluted the search results associated with my site.  That is a quick way to get blacklisted by Google.

Photo credit: somebox