Facebook is hosting a press event at 10am Pacific time Monday morning, and the most popular rumor making the rounds is that the social-networking site will expand its messaging service into a full-fledged e-mail service. We polled the PCMag staff for their thoughts on what a Facebook e-mail service should entail, and here are their thoughts.

1. Message Folders: If Facebook opens up a more comprehensive e-mail service, we'll need to separate our Facebook invites and app updates from everyday messages. Folders, please.

2. Personal E-Mail Address: We already have Facebook vanity URLs, why not a chloe@facebook.com e-mail address, too? What's another e-mail address to add to the Gmail, Hotmail, Yahoo, and work addresses?

3. Multiple Client Support: That being said, a Facebook e-mail should support a variety of clients, including standard e-mail clients, not just Facebook's Web interface.

4. Offline Mail Reader: Gmail has it, and I imagine the social-networking site would want its mail product to offer just as many features as Gmail.

5. Permanently Delete Messages: We all know it's a bit of a hassle to permanently delete your Facebook account; simply deactivating doesn't cut it. Let's make sure those deleted e-mails are also gone completely when we hit the "delete" button and don't wind up as the focus of the Wall Street Journal's next Facebook privacy investigation.

6. Bulletproof privacy: Along the same lines, privacy has to be airtight. Facebook has had its up and downs in the privacy arena recently; here's hoping our private e-mails don't end up in the hands of data brokers or third-party ad networks.

7. Support Microsoft ActiveSync: Get e-mail in real-time, sync a smartphone calendar with Facebook Events and a smartphone phonebook with Facebook friends' contact information.

8. Multiple addresses: If you're going to introduce an e-mail service, make sure it's robust. We want to include as many people on an e-mail list as we want, and attach more than one photo or document.

9. Multiple links: And when I'm e-mailing multiple people, I also want to be able to attach multiple photos or documents to that message.

10. Better anti-spam: Facebook's current messaging service is a bit lackluster, but at least it's not plagued by too much spam. With personalized e-mail addresses, that's likely set to change. Implement some strong anti-spam policies to avoid that from the start.