Yes! That is exactly what my friend does! Her announcements about major life changes are usually wishes about the future rather than something that's happening now.

And, yeah, the only way I am getting suckered is by believing something important has happened and asking her about it. There's no actual harm done.

My friend doesn't seem bothered at all when she makes announcements about things that wind up not happening. I do ask for followups when I see her - if <<new boyfriend/new job/new place>> didn't come to pass, she just says it pretty matter of factly.

Now that I think about it, it's only Facebook that she makes these overly optimistic statements. Talking to her in person or on the phone, she is just as direct as could be.