Facebook began rolling out a new messaging service on Monday that ties together text messages, instant messages, Facebook messages and e-mails sent to a username@facebook.com address.

Facebook CEO Mark Zuckerberg acknowledged that the system is not meant to kill Gmail or any other messaging service. Whether you believe him or not, Facebook's new service will definitely not kill e-mail as we know it.

Instead, it may actually make Yahoo Mail, Windows Live Mail and Gmail better. It's also important to note that Gmail's market share remains far below that of Yahoo and Live Mail/Hotmail, though Yahoo's share was declining earlier this year. Looking at just Gmail, here's how Google can painlessly borrow from Facebook's new features.

• View all messages with a single person. Google users can communicate through Gchat, Gmail or Google Voice. That's instant message, e-mail and text message. Right now, if you search for someone's name in Gmail, you can usually pull up a list of all the threads you've add with that person across all three mediums. (You have to enable forwarding in Google Voice of text messages to your e-mail for this to work.) It won't be tough for Google to more forecefully offer Google Voice integration and then display the individual messages from all those threads into one long stream. This feature will be most important on mobile devices such as Blackberrys, Androids and iPhones. And Google, unlike Facebook, has an off the record feature.

• Quick messaging. Google Calendar users know you can quickly add an event by typing in the most pertinent information such as "7pm dinner with sue at rosso oro's," and an event is automatically created. Gmail could easily add a similar feature that would let you choose a name--and let you send a message without a subject or needing to know the person's e-mail address. If the person's online on chat, the message goes there, otherwise the person's phone. If the text isn't read or replied to within a certain period of time, it gets sent to the person's e-mail. The message becomes like a heat-seeking missile, moving around without leaving too much of a trace until it reaches it target.

• Go beyond the social inbox to social messaging. With its Priority Inbox feature, Google has technically already rolled out a "social inbox." Though Facebook has found a way to make messaging quicker, they nor anyone else has necessarily found a way to speed up the time it takes to read e-mails. There will always be those people that write long messages. Even texts can be confusing and burdensome to read once in a while. The ultimate killer feature would be something along the lines of a headline-writer--something that pulls out the key details of an e-mails and boils them down into one phrase.

Facebook messages isn't about to kill Gmail because people aren't about to trust sending their bank statements to their Gmail account. Who knows how Facebook would use that data if the company got its hands on that. Facebook isn't likely to gain ground with enterprise users either.

Google has had its own share of problems and security concerns getting businesses to switch over to Google Apps. Facebook has been dogged by privacy issues from the beginning, unlike Google, which actually started off with a "Don't be evil" motto. If people can barely trust Gmail with sensitive data, the majority of users aren't about to trust Facebook.

Google CEO Eric Schmidt said Gmail's focus has always been searchability and speed. Now, they'll just have to be quicker and be able to search across more platforms.

The fact that no one wants another e-mail address has been written over and over in recent days. But do sign up for the @facebook.com e-mail address when you get a chance.

Facebook's "other" folder provides a cool use for the @facebook.com address. Many haven't caught onto the ability to use Gmail aliases when signing up for one-time-use accounts on websites. The @facebook.com address could prove very useful for getting logged onto some sites quickly without having to deal with spam later down the road.

Something else to keep in mind is that AOL released a new version of its e-mail system on Sunday, aiming to gain back the third spot from Gmail in terms of users. One of the best features in AOL's updated service is culling together your messages from Gmail, Yahoo, Hotmail, Facebook and Linkedin into one place, though each is acessed in a separate inbox.

Reach executive producer Paresh Dave here. Follow him on Twitter: @peard33.