imo.im is a web-based instant messaging service that allows users to connect to multiple third-party instant messaging networks and communicate via chats consisting of text, video, and voice. Third-party messaging services currently supported by the service include Google Talk, AIM, MySpace, ICQ, Yahoo Messenger, Skype, and Facebook. The user registration and sign up process requires an existing account with one of the supported third-party messaging services. This article will teach you how to set your status to invisible on imo.im.
Steps
1. Learn how to sign in to imo.im.
2. Click the context menu at the top right of the page to select a status. By default, your status will be set to “available”.
3. Select the “Invisible” option from the drop down menu to set your status. This will ensure all of your buddies will be unable to see when you sign in and out of the imo.im service. You will still be able to communicate with buddies.
Link Source : WikiHow