It's like the folks who post a vague comment on Facebook such as "Wow, I can't believe this happened" or a mysterious quotation with no further explanation as to what it's all about. That translates as one of two things to me... either (A) you want me to ask, responding to your need for attention, or (B) you don't want me to ask, you want me to ponder it and come up with possible scenarios. You want me to worry about it. In reality I find it just plain annoying.
I once worked with a woman that frequently, at least once a week, wandered in the hallways moping, head down, walking slowly, sometimes teary-eyed, looking like a lost soul. This generally achieved the desired result... which was for everyone to take notice, ask what was wrong, and attempt to comfort her for the issue of the day. I learned to ignore her altogether when she was putting on a show. I'm not saying that no one ever has a down day or doesn't have the right to show it, I'm just saying that regularly scheduled performances are overkill and eventually have the opposite effect on folks... no one will take notice, and no one will care when the time comes that you really do need a bit of comfort.
The folks who don't want to tell you what's bothering them, or will tell you when asked that their comment meant nothing, bother me even more. Something had to be on your mind to inspire you to post that picture, or that quotation, or that comment! If you didn't care to share your thoughts, why bother to share anything at all? It's kind of like saying "I want you all to notice that I'm upset, but I'm not going to tell you why." Childish, irritating, frustrating, time wasting!
For heaven's sake, if you've got something you want to say, or need to say, just say it! I deal far better with situations that I am aware of than I do with situations that leave me playing guessing games. Most often I will decline the invitation to play. No thank you, I don't need this kind of drama in my life.