A simple app to say "yo" to friends

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All you do is just tap someone's name and it sends them a push notification saying "Yo." There's nothing else to this app, and you can't say anything else other than yo. I saw it posted by Robert Scoble on Facebook and he called it "the stupidest but most addicting app ever." I'm intrigued. If anyone wants someone to test it on, my username is "danlev". From the founder, Moshe Hogeg: "Yo took 8 hours to develop and it already sent over 2M Yo's!!!" https://www.facebook.com/photo.p...
Ha! The simplicity reminds me of WUT. I love stupid simple, why-am-I-using-this kind of apps. Downloading now.
New Yo update to v 1.1 includes Link Sharing, Hashtags, and Yo Index (http://techcrunch.com/2014/08/12...). Thoughts?