File this under ‘why didn’t I think of that?’ An app that lets you send just one word, “yo,” to friends has nearly 50,000 users and just received $1 million in funding. First, the VC community is going absolutely crazy on any new messaging app. Second, props to Or Arbel for creating the app and snatching seven figures already.

Or Arbel talked about the response to Financial Times about the early success of Yo.

“They all loved the simplicity, except one who said this is the stupidest app he’d ever seen,” said Arbel.

“They” would be influential people around Silicon Valley including employees at Foursquare and Kickstarter. Prominent tech blogger Robert Scoble is also a fan.

Mobil’s chief Moshe Hogeg is the person behind the $1 million investment.

Arbel has some ideas on ways to expand Yo. These include Yo buttons for bloggers to alert readers about new posts or brands to send out Yos to announce sales.

When I first heard of this app, I thought it was ridiculous. But the more I think about it, the more it’s simplistic idea grows on me. I can see Yo being a huge hit, especially if Arbel expands his idea towards bloggers and retailers. Sometimes it’s the simplest ideas that are the best. And, Yo is as simple as it gets.

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