Where are all these Necroposts coming from?

[Lindal Kidd]

Wow, almost every post in Answers today has been resurrected from four or five years ago!  Is this the start of the Zombie Apocalypse?

[ChinRey]

4 minutes ago, Lindal Kidd said:

Is this the start of the Zombie Apocalypse?

Yes

[Rolig Loon]

Dead on. 

I don't mind people posting on those old threads so much.  What bothers me are the number of people who believe the outdated stuff in them and don't post.  I wish there were some way to tell people to double check answers that are more than a year old.