My son used DuoLingo to learn Arabic as well! Then once he's gotten as far as I could with DL, he switched to Mango -- which he says is actually working better for him. He's been at it for ... at least 3 or 4 years now and can write/speak/read pretty well I think. 
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anne@toot.cat
@anne@toot.cat
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New Instance #Introduction: I’m a #Linguistics professor in #Texas.