Albert and Bob are both interesting to find the counterparty about a specific product X.
Beside use google search or they both know each other's contact already, they can leave message in BtcDealMessage by the BTC Deal Message Input Form to inform the interest in bitcoin community and get notified by the RSS feed mechanism.
For example, Albert may first input a message in the form:
From Albert's bitcoin address To all people Message Does anyone want to buy X ? of course, I mean in BTC
And both Albert and Bob subscribe to two RSS feeds about this. One feed is message about "to me", the other is message about X. So Bob will get notified and know Albert's address and Bob can input a message in the form:
From Bob's bitcoin address To Albert's bitcoin address Message I want to buy X. How many stocks you have? Do you mind we chat on skype or else? btw, kindly show me that you control that address by adding the signature on a message
In this way, they can subscribe to even specific RSS feed about message "from the other" "to me" to start more specific communication:
From 1ESHzedmNkAF9Cjv11uFqmCkLCj3B8DMeA To Bob's bitcoin address Message I have 300 kg X Signature ICaSTbmPW7iIguf2XzH4ocuHHRzCPnkpHEserEegwL9cdocbvjaxAtdlTCQn74YdEJ7/6t/Gw7xRGQ6WP8KviDE=
And continue by the RSS mechanism or by skype if they ok