The connectivity problems began around 3:30 PM ET according to downdetector.com, peaking around 4:20 PM. Though the service appears to have resumed for many users, some report still being unable to send or received messages, while others report slower operation than usual. WhatsApp outages are pretty rare — one would hope, given its popularity — and we assume it won’t be long until service is restored globally. If you’re still experiencing difficulties, just hold on a little longer. Update: Service appears to mostly be back.