When did the Informed badge start?

Scrolling through the list of badges today, I found one that I had never seen before: Informed. I've consulted the list several times before and have not seen it so it must be relatively new. This raises a few questions.

1. When did this badge become available?

2. Are new badges announced (on the main site or on meta)?

• And suddenly there is a big spike in the number of Informed badges awarded.... (or so I assume) – user14972 Jan 19 '13 at 19:45
• @Hurkyl Yes, and very few of the Informed users so far are new users, for whom the About page is intended. – user53153 Jan 19 '13 at 21:29