If theres a blue dot or indicator on someones profile saying he or she was Recently Online, it means that person logged in to Zoosk at least once within the last seven days.

How do I appear offline on Zoosk?

From your computer: scroll down the Search page and click on the Go invisible button. Once selected, the bar at the top of your profile will turn from blue to purple and you can avail of this feature for 30 minutes. A countdown will be displayed from the time that this feature has been activated.