Alright, I'll admit it; I'm the one who started the [cpp] <-> [c++] tag synonym vote. :(
I was (as usual) awake late, when I saw this new sparkly info tab! What could it be? (I hadn't read about it at all.) I saw the tag synonym and thought "Oh, I could be one of the first to propose one!"
I pondered for something to propose, and I recalled that long ago a question had [cpp] instead of [c++] and thought, "Hm, perhaps that'll do." I know cpp is the C Preprocessor, but I checked the tag anyway.
And to my surprise, if I remember correctly, there were no questions tagged cpp. (Probably due to this.) It was surprising but I didn't care.
So I went ahead and proposed it, and it was voted in, and I felt joyous and happy. But now I am full of regret at what I've done to the poor C preprocessor. :( I'm sorry poor C preprocessor.
(Had there been any C preprocessor questions under the [cpp] tag I'm sure I would have left it alone.)