Facebook's sent out invites for a press event this coming Wednesday, to be held at a restaurant in San Francisco. Why?

Facebook has scheduled a fancy invite-only event in San Francisco this coming Wednesday (, for some). But here's the problem: The company hasn't released any details, either on the invite or through unofficial channels, as to what it plans to talk about.

Of course, that assumes that Facebook will be using its time to make a big announcement of some type. The company could very well offer an extended preview or more constructed timeline for news we all already know about: Specifically, the growth of Facebook actions, or the third and final component of the company's .

We've already seen a bit of dabbling in Actions since the feature's announcement at the F8 conference last September. These have mainly consisted of just the "read," "listen," and "watch" actions that accompany user interactions like "" or "Read an article" on papers like The Guardian or the Washington Post. Key to Facebook's strategy is action automation, or the seamless posting of these updates whenever a user performs a function within a Facebook-friendly application or site.

And, we should note, Facebook just recently bolstered the "listen" action an action (not a "Facebook Action" per se) that allows users of the same music service to listen to the exact same song at the exact same time. Should they desire to chat about the lyrical brilliance of their shared tune, a Facebook chat window pops up and allows them to toss comments back and forth.

But what could be on the horizon for Actions? If that the secret sauce that Facebook's packing into its Wednesday drinks and appetizers event, perhaps we'll see a head-nod to new lists and categories of actions that Facebook's planning to integrate into its service. Like, for example, the fabled "cooking" action"Johnny User cooked up a quiche from Recipes.com" or a "gaming" action like, "Susie User is playing Peggle on Steam. Click here to join her."

And if it's not actions, then what does Facebook plan to chat about come Wednesday? Does the company have a new acquisition or partnership to announce? (Possible!) Will founder Mark Zuckerberg announce the date of the company's ? (Nope!) Is it time to unveil the ? (Double-Nope!)

Check back Wednesday for all the details.

For more from David, subscribe to him on Facebook: David Murphy.