How does the Twitter followers compare to the Facebook fans?

I understand that these two networks are completely different with each other.

But I'd like to know how does Twitter followers and Facebook fans compare to each other, for example when comparing both in similar situations, equal number of fans/followers with similar demographics, same content and similar subjects, which one would translates to more social visibility?

Source: http://webapps.stackexchange.com/questions/46446/how-does-the-twitter-followers-compare-to-the-facebook-fans

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