There could be. Ben McConnell notes that:
With BzzAgent getting a big chunk of change, it's safe to assume more companies which promise to aid and abet word of mouth will announce themselves in the next few months, some backed by big money, some backed by credit cards. Some will claim to be competing in the space when that hardly seems to be the case.
It's the beginning of the bubble.
Then he makes a prediction which I think has a very good chance of coming true.
You'll know the bubble is ready to burst when someone promises to "create massively contiguous swarms of buzz-spreading influencers and evangelists who will make your product cool."
I can hear the business plan buzzwords already.
Thanks to whoever submitted the story. (You should really register so that people can give you credit).