Vaguebooking is any update on a social network (although primarily Facebook) that is intentionally vague. Status updates which fall under the category of vaguebooking can be long or short, but most comprise just a few simple words. Regardless of the length they all have one thing in common – to elicit a response from friends and followers.
While the majority of us will just be clear about something that has happened or why we’re upset, vaguebookers take great delight in beating around the metaphorical bush. Seeking attention while giving away as little as humanly possible.
Definition from the Urban Dictionary, and a few examples
A few more examples (you can even submit the ones you find)
Why it's usually not a good idea:
5 Reasons Vaguebooking is Destroying Your Relationships
The next time your friend posts a vague FB status, reply with this video
A slightly different perspective:
In Defense of Vaguebooking