artwork Best way to create a contest in social media - 3rd party?

Last time I tried creating a giveaway contest using Facebook, and promoted the post to get people to like/share a "Tag someone who loves hot sauce" post that encouraged people to check out the site, like the FB Group page, share and/or tag someone else.
 
It worked great, except for one small issue... FB only lets you scroll back so far to see who actually complied.  They truncate the list after a few days.
 
Is there a 3rd party site or FB app that would let me post the contest info on it, and feed me back the qualified candidates upon completion?
 
It seems that FB is not very user friendly in this aspect and since some companies use 3rd parties for surveys, perhaps one may be utilized for prizes/giveaways/publicity?  Anyone have any insight on these?  I'm starting to dislike FB more and more lately, between them deleting content and their click-farmesque advertising structure.
 
Back
Top