The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Max Myers:
Too Tacky is an anonymous photo sharing app. Laugh at pictures that are cool or funny that are nearby. "Tack" a picture that you think is cool/funny or share your own pictures all anonymously.