facebook_widget.jpg In a report earlier this month by EdgeRank Checker, found using 3rd party API's on Facebook substantially decreases the likeliness of fan engagement, some up to 80%. 

We ran our analysis on 1,000,000+ Updates on 50,000+ Pages that influence over 1,000,000,000+ Fans. We took each individual post and analyzed the engagement (comment & likes) along with how many fans the Page had at the moment of updati [...]

Read More: EdgeRank Checker Reports 3rd Party API's Decrease Facebook Engagement