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This article explains it.
>Reddit user /u/mofosyne/ recently posted a link to a prototype NFC Message Board android app they made 7 (Source code 8). It allows people to place cheap, often water resistant NFC tags in pre-defined public places so those wanting to communicate can post and receive short messages to the chip using their smartphones. The messages are currently only plain-text, but there is scope for future development with encrypted signatures in larger capacity NFC tags.
Those without google play can find the nfc message board app on f-droid.
Well contacts and URL are pretty simple.
BTW do check out this NFC toy I created
https://play.google.com/store/apps/details?id=com.briankhuu.nfcmessageboard&hl=en
Or you can use NFC for other cool things like automating home tasks with tags or dead drops.
Try an NFC message board?