I love traveling and I can't help feel apps like this take something away from the experience. Perhaps not though? Maybe all those times you're sat at the hostel by yourself because there didn't seem much going on you could have used Yarn to find some mates. Probably like everything else, good in moderation but don't rely on it...

p.s it's also super new, being released last week so it will be interesting to see if there is actually any buzz around it.