Huda Toriq

With this plugin, Yahoo Messenger users can put a nice, fully customized image button that shows whether they’re online or not on their blog.

Yahoo Messenger Online Status

Allows blog owners to show their Yahoo Messenger online status using their own status button.

thenbrent

Looking for maintainers. This plugin is currently not maintained. If you would like to take over the development please let me know using the plugin support forum or GitHub issue system.
WordPress Social Login is a good alternative to this plugin:
https://wordpress.org/plugins/wordpress-social-login/
Social Connect adds social login buttons on the login, register and comment forms of your WordPress site.
The buttons offer login and registration using a Twitter, Facebook, Google, Yahoo or WordPress.com account.
It makes it super easy for new members to register with your site and existing members to login.
<h4>Props</h4>
Special thanks to:
<ul>
<li><a href="https://wordpress.org/support/profile/markusdrake" rel="ugc">markusdrake</a> for patches and helping in the support forums;</li>
<li><a href="https://wordpress.org/support/profile/enochfung" rel="ugc">L D</a> for patches and helping in the support forums;</li>
<li><a href="https://wordpress.org/support/profile/geodanny" rel="ugc">Geodanny</a> for helping in the support forums; and</li>
<li><a href="http://blog.wirone.info/" rel="nofollow ugc">Wirone</a> for polish translation and patches.</li>
</ul>
And everyone else in the forums sharing the fixes they find and answering each others questions.
<h4>Contribute</h4>
Social Connect is rapidly growing in popularity and help with the growing pains is appreciated.
If you’re a developer, you can contribute fixes & optimisations via <a href="https://github.com/thenbrent/social-connect" rel="nofollow ugc">Social Connect on GitHub</a>.
Everyone can help out by answering questions in the <a href="https://wordpress.org/tags/social-connect?forum_id=10#postform" rel="ugc">Support Forums</a>.

Social Connect

Allow your visitors to comment, login and register with their Twitter, Facebook, Google, Yahoo or WordPress.com account.

Yahoo Messenger Online Status vs Social Connect