No, definitely Bitcoin

Bitcoin isn't really all that cool though.

It replaces trust with massive resource consumption and doesn't do a good job of being digital money (it is hard to use safely, it is hard to use anonymously).

It is cool because it really disintermediates powerful entities. Maybe the first iteration of digital money/assets is not that efficient, but that could also be argued for many other innovative technologies.

What is groundbreaking is the concept of P2P value exchange. And that's what bitcoin really is, still a young PoC that will surely evolve or get superseded by a 2.0 tech.

The genie is out of the bottle....

Eh, bitcoin is still a cool proof-of-concept. It's just that as it often happens, people took it to production when they shouldn't.

Agree, particularly this bit describes the blockchain hype...

> "various 'experts' on it will spring from nowhere to lecture us all about it"

I suppose that partly depends on exactly how novel the blockchain part is, but broadly speaking the world of efforts to combine some of electronic money, cryptography, proof of work and decentralisation was not a new one in the late 2000s. For example Ecash had been hot once https://en.wikipedia.org/wiki/Ecash , while later on Hashcash got a fair bit of attention as a possible solution to the spam crisis. In 2007 (early 2010 is another story) it was definitely more of a deep cut than AI or cloud, though.

AI was hot too before winter came

definitely Bitcoin/Blockchain. I wouldn't say it will actually disrupt traditional banking empires, but it was the next big thing and 'experts' definitely came out of nowhere and its still pretty cool.

AI wasn't totally unknown: basically every coastal university during the 1970s and 1980s were filled with people working on AI, and it didn't die off, it just became embarrassing to work on.

Neither was user generated content (that's what the original web was) or social networking (irc, email, bulletin boards, etc). Making it useful and usable beyond an academic and techie niche was new.

> Neither was user generated content (that's what the original web was)

The fall and return of the cat picture still amuses me. In the early days of Web adoption when people would put up a personal home page just for the thrill of having one, stereotypically the only bits of content they would be able to come up with for it were a list of favourite bands and one or more scanned-in pictures of their cat. So for years and years afterwards cat pictures were a synechdote, a punchline for jokes about the naïvety of the early Web. Then phone cameras and low-effort social media became big, and ...

And more, the AI hype-cycle was definitely on the upswing again already by the beginning of 2010. The Netflix Prize and the motor-vehicle DARPA Grand Challenges were all 2000s events, for instance.

Ummm, Uber?

Crowdsourcing / the ‘sharing’ or gig economy are huge.

Doesn’t really qualify as unknown and unpredictable. We’re in about the third AI bubble right now, and I doubt it’ll be the last.

I thought about virtual assistants and deep fakes

Regarding deep fakes, I don't think you're wrong, just early. I think we are just getting a glimpse of what is unfortunately possible as this decade closes out, they could introduce some real chaos as in this new decade.

Edit: spelling

Neither virtual assistants nor deep fakes can be considered "the next big thing". They're in their infancy.

Nah, the rise of cloud, Shirley?

Not at all unforeseen by the end of 2009 though. The GMail beta dates to 2004, while EC2 was announced by 2006, and that's aside from all older precedents or predictions. (That said, not everyone 'got' EC2 at first.)

neural networks are not new