Google Wave was a product few people understood and, perhaps because of that, few people used. In practice, it was something like a rolling email conversation, IM chat, and Facebook-style news stream all mixed together. Those who could figure out what to use it for tended to like it. Unfortunately, there weren't that many of those, and an August post on the Google Blog said, "Wave has not seen the user adoption we would have liked." The announcement spelled the end of Wave development as a standalone product, though the company promised the technologies used would show up elsewhere. And so they are, in the open source and enterprise worlds. The Apache Foundation, for example, announced in early December that it would bring Wave into its incubator program.