Show HN: Export your data from Twitter/Facebook/Gowalla/Google+ as JSON
export.synack.me
export.synack.me
Full disclosure: I work on this!
Also saw you are using gauges, how do you like the reporting?
I am not storing any of the data or even your OAuth tokens after the dump has been completed. As an implementation detail, your email address may remain in a log file for up to five days.
If you're comfortable with releasing your code, it would be awesome to have some sort of "offline" mode where users could opt in to downloading your scripts and running them locally. That way you'd be affording ease of use and allaying anyone's security concerns. Of course releasing code opens up a whole other can of worms (maintainability, license), but until then I wouldn't feel comfortable running my exports through your sites, as much as I support the idea. Others might feel differently though, in which case the site has a ton of utility.
That said, I might open source it at some point just so that people can audit it and verify that I'm not doing anything malicious.
As an aside, i figured why not have the ability to download your social graph as well (as much as possible with public profile data)
I think the next step is an api. That way other developers can use your service as an import to their apps.
That is - of course - if that interests you.
Good stuff.