Facebook's extremely popular instant messaging service for mobile phones is down right now. WhatsApp official status twitter account (<a href="https://twitter.com/wa_status" rel="nofollow">https://twitter.com/wa_status</a>) shows no activity since 2014. Twitter users are actively tweeting about it right now (<a href="https://twitter.com/search?q=whatsapp" rel="nofollow">https://twitter.com/search?q=whatsapp</a>).