The way I was looking at it was people will get messages on WhatsApp but won't reply immediately. Same on Facebook. But people will also visit Facebook.com when

The way I was looking at it was people will get messages on WhatsApp but won't reply immediately. Same on Facebook. But people will also visit Facebook.com when ignoring messages so you still get online status info even if they aren't specifically using the chat. If you could look at WhatsApp and Facebook and combine the data you'd probably get a really accurate overview.