There have been instances in the last week of someone hacking various people's accounts here, on TH, and on reddit. That's why we and TH are both pushing the two-step verification thing right now.
We don't actually know that this is related to the Imgur thing. It just seems like a likely culprit. While Imgur was hacked a few years ago, they only just found out/announced it last week. The data from that breach has to be available somewhere. Maybe someone that knows how to find such things heard about it and went looking. I don't know. All we can do is speculate. But I do think the very minor inconvenience of having to enter a code once a month is worth the extra later of security, especially with what has been going on in the last week.