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It's just a spare domain name that we have and I use it to correctly redirect things onto our server (because it also serves other content). Also in the future you'll see the link between this domain and steempress ;)

So... that web is processing post vars like bridge?

The plugin gets all the important informations and sends them to our server which is connected with the steem blockchain and who will do the posting.

We can't connect directly to the steem blockchain via the plugin because php's vanilla cryptography is not evolved enough to create steem transactions.