When you see either the smile or the heart, you also have the option to send a message or a virtual gift. Lots of Zoosk users will send just the heart or smile and not say anything but this isnt the best way to approach it. To be successful on Zoosk, you have to do a lot of work.

What does no circle mean on Zoosk?

Its a setting that means your profile is invisible to anyone on the app unless you message them first. It is a premium option and means other users wont be able to see you unless you have messaged them. You can also pause your Zoosk account while you figure out where the relationship is going.