Typing with both fingers.
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What your url? (PM them both if you don't want to disclose them)
And:-
Unless he/she has actually stole your coding line for line you can't do anything and shouldn't really complain if its just the 'technique or principle' they have stolen.
Just stay focused on your own site (and be aware of your competition) it won't be the first or the last time you will encounter a site that has the same 'functionality' as yours.
Although I may change my opinion on your situation after seeing the urls.
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