SNAX is a blockchain with its own crypto (like STEEM), that allows you to earn SNAX through tweets and the posts you make on STEEM. So, basically, as you make STEEM, you also make SNAX. So far, SNAX aren't worth anything, but dragosroua is a SNAX block producer (as well as a lower level witness for STEEM), and he seems to like the idea quite a bit (he's been running a 30-day writing contest about it).

So, just another way to tokenize what you're already doing, and with any luck, SNAX will eventually be traded somewhere and start gaining value, just like any crypto manages to do.