These days, people are always "online", but rarely really around. In Fleep, we have taken a slightly different approach to showing someone's activity in Fleep. Instead of online/offline indicators, you can check someone's status with the Last active indicator.
When you take a look at the Members pane in a conversation or click on someone's profile, you will see the Last active information:
Last active is just one of three Presence features in Fleep. The other two being the writing indicator (1) and the "Seen by" indicators (2):