Ziff-Davis recently purchased IGN and all its properties, which includes 1up, GameSpy and UGO, and today they've set about restructuring the whole place, leaving behind many casualties.
According to an internal memo obtained by Polygon. ZD wants to focus all its efforts within the properties they just purchased from Fox behind the core brands, IGN and AskMen. And so they're shutting down 1up, GameSpy and UGO as separate entities and consolidating assets behind those bigger names. What that means is that some folks at IGN are being laid off as well and probably some people from the other sites will be kept on and brought into the mothership. This is what we call "corporate restructuring."
It never really made much sense to have three sites owned by a single company that serve the same audience and produce very similar content. This move was inevitable.
RIP 1up and GameSpy