Does "whatsapp" sound like messaging? or "Skype"? or "Slack"? or "IRC"?
The other two are meaningless, but at least monosyllabic - "I'll Skype you," "I'll Slack you," "I'll ... Element you?"
Element is a much better name than Riot. Lot less of a hard sell to convert normies.
chat does sound like messaging
Skype sounds like a made up word. Nothing wrong with that.