[d2s]

Useful service. Looks more simple than it is. :)

[olegp]

Glad someone sees and appreciates all the effort we put in :)

It is indeed a bit of an iceberg, in that there's a ton of stuff under the hood that users don't initially see. We've done a couple of talks on the tech - you can check them out here:

http://www.youtube.com/watch?v=pmyDJnEza6A

http://www.youtube.com/watch?v=J8KGguflMCc