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Downloading and archiving every conversation online is expensive and I'm not sure enough users would be willing to pay to have a centralized message reply service.

I guess that in Silicon Valley where the money grows on trees, a business model is optional.

Funny you say that. This data is already stored at Google, Facebook, Twitter et al. All I'm asking for is for it to be indexed and available to me to search. For the amount of time I spend searching for old content, I would even pay a small amount for this feature as it would save me time.

Yeah that's true, I wonder if there is a way to run a search on all of the major chat platforms though only your messages. You must say some important things to want to get your history back :).

It's not just chatter, it's more about sharing. So I share something interesting on Twitter, then want to reference to it in a post on Google+ (don't laugh).

Or I stumble upon an interesting link about X, and want to use it as a blog post but forgot to save it. It's just convenience and time saving. My time is worth more to me than a few dollars or a bit of my personal data.

Checkout http://www.infoaxe.com/aboutinfoaxe.jsp

It's something close.

Doesn't Greplin do this?

Why has no one done this yet?