every time I log in, in the past 2 weeks, the GNS post button blinks green. It should be normal but I always see that there's no news. I think it is a bug.
No, it's the "Flashnews" section at the bottom that's updating. If you hover over the icon while it's blinking green, it will tell you what kind of news is being updated. "Posts" refer to the major news pieces, while "Flashnews" are the automated event lines in their own section at the bottom.