I never thought I would ever use a service like When Online, but work required it. Sometimes it's necessary to find out if a person is really online and whether they have liked or commented on something. This service allowed me to do that quickly and efficiently. What I especially liked: 1. The reports are very clear, and I can see when the person logged into VK, when they commented or liked something. 2. Everything is done anonymously, so there's no need to worry about someone finding out. 3. It's convenient that you can just paste the link to the profile, set the desired date, and see the person's activity.
