Showing your online presence helps your readers to give you feedbacks or ask some questions.If you want to show your online presence, Yahoo ! has a feature for doing this.All you need to do is simply place a HTML code in your webpage.
You can also use this code elsewhere where you want people to socialize with you online through yahoo like forums,discussion boards....Spamming increases with this kind of things normally.So I recommend you to use another Yahoo ! ID before you insert the code.
Thnx to Mr.Byte.