Now various accounts like facebook, gmail, yahoo mail, MSN have integrated Instant messenger to chat with the users who are online. If out to chat with the user who is online you need to go to the logged-in account and chat with them. IF you see all the people who are online in one window it avoids you to navigate to the other account window to see the chat messages and the people who are online.
imo.im is the website works as a Instant Messenger which integrates all the accounts from the gtalk, skype, yahoo, msn AIM, myspace and facebook. Add the account to the IM and see all the users who are online from various accounts at one place. If you made any conversation with some one last time ago you can see the conversation using the history option. Facebook IM doesn't have any option to make a video call or voice call, if want to make a video/voice call from the facebook the other user also need to login to the facebook using this website. You get message notifications to your desktop if someone sends you a chat message. You can make calls using the skype. If you have an account in the website where there is no option to login using this website, you can login manually.
For chrome users there is a application, after installing this application you can navigate to the website by opening a new tab and hitting this application from the apps column.
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