2. A completely uninteresting piece of news.
3. Coporate Bullshit.
Comes from deviantart, where notices known as "hot topics" are labelled as "H" in your messages. They're almost always completely uninteresting, lame promotions, and a total waste of time.
"Chechnya went 1H after a few years"
"Why is it that whenever I send a letter of complaint to some company, I get a load of 1H back?"