Reuters is reporting that they received an invite to a Facebook ‘Mobile Event’ happening tomorrow, November 3, at Facebook’s Palo Alto headquarters. What is being unveiled at this event remains a mystery, however.

There has been much speculation in the media, specifically on TechCrunch, that Facebook has been developing their own phone. After those reports in September, a Facebook spokesman, Jaime Schopflin, was very quick to deny the allegations and rumors preferring to maintain that they are working on “deeper integrations with some manufacturers” and that “building phones is not what we do.”

Last year, Google responded to rumors of a Google phone in much the same manner and this year saw the release of the Google phone, the Nexus One, so anything is possible.

Looking at the image on the invitation it is hard to say if t it is indicative of a Facebook branded smartphone. At first glance, I thought it was surely indicative of a Facebook smartphone due to the whole “cups connected by string” aspect but upon further reflection I realized that that is not necessarily so. The event has been announced as a “Mobile Event” so it it having something to do with smartphones is being made pretty clear. The cups-string imagery is just a fun way of showing communications augmented by a human invention (granted the cup being extremely primitive) and it is just more interesting to look at than a picture of a phone. Maybe the point of the image was to get all of us speculating and build more media coverage of the impending event.

This also just occurred to me as I wrote this article. Depending on your definition of ‘mobile’ we can call tablets - like the Apple iPad, the Samsung Galaxy Tab, and the BlackBerry PlayBook - mobile devices. Perhaps Facebook is NOT going to be unveiling a smartphone and instead are going to unveil a tablet device of their own? Maybe one with a front-facing camera which will work with Facebook Chat as a challenge to Skype? The more I think about it, the more it makes sense and seems possible. The tablet market is one of the fastest developing, latest and greatest on the gadget scene for 2010 with the release of the iPad and many companies are getting into the game. It is not a market that has entrenched players and might therefore be somewhat easier to enter than the smartphone market.

Only time will tell! Tune in tomorrow at 10:30am PDT (1:30pm EDT) to find out!

For more check out Reuters here and here

And for even more see TechCrunch