In Fleep, you can check someone's status with the "Last seen" indicator. When you take a look at the members pane or click on someone's profile, you will see the "Last seen" information:
The "Last seen" is just one of three Presence features in Fleep - others being the writing indicator and the "Seen by" indicator. When Presence has been enabled, other Fleep users will be able to see when you were last active in Fleep, when you are writing a message in Fleep and when you have seen messages.
Read more about Fleep Presence in our blog or take a look at this quick video guide: