It existed in the past, now i think if you are paying member you can have it but with other paying member.

It's a pity that in Italki they eliminated the chat, but you can make friends here through text messages.

It exist before but I don't see it now.. Well I like it better without instant message.

Dos personas pueden chatear cuando ambas han selecionado la opción de seguir. Es decir si tu sigues a una persona y esta te sigue a ti, podeis intercambiar mensajes online.