Almost half of the orkut users are using this feature in there orkut profile if you dont have this feature then check yours orkut setting in Gtalk tab , there you will find the status of you gtalk integration

Online friends appearing Invisible in yours Frineds list ,How to find that easy use orkut application “i am Online ” and Detect invisible yahoo Friend in Orkut.You can also use this apps for displaying message to all friends that you are online at orkut at that time.

There are many popular application in Facebook that help in  chatting with yours family and friends Scrapboy is a popular desktop application that will enhance yours facebook surfing . This tool is easy to use and best for Facebook chatting purpose . you can easily go online and offline or become invisible with this tool.Scrapboy [...]

Many Users  prefer to stay offline while using Yahoo! Messenger not only  to avoid someone. but also to keep away from spammers and also from strangers, If yours friends are ignoring you in Yahoo messenger ,and appearing offline to you in Yahoo id then it can easily be detected who are online but even when [...]