Add a Facebook style chat toolbar in your WordPress-BuddyPress installation.
Most of the plugins offering chat feature in your BuddyPress or WordPress site don’t work. They affect some other functionality and create some errors. But now I know a nice plugin which works best. First I was ignoring it because after installation it asks to get an API from its site (like Aksimet) so you need to register on its site and get API for your chat. One day finally I used it and it worked best.
If you want to give it a try then install Envolve Chat and activate it. You can easily customize it from your admin Dashboard > Settings > Evolve Chat. You can change its visibility to Public, Admin or Specific Users. If you make it public then you can even chat with the unregistered visitors of your site. It works both in WordPress and BuddyPress installations. It also provides you with the option to change interface language.