It's php/MySQL.
The suggestions you, fabien and abit have made about deeper integration with Steem blockchain sound awesome but are way, way beyond any capabilities I would have. That definitely sounds like the preferred way to move forward though.
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@jesta recently released steemphp library (https://github.com/greymass/steemphp) and @arcange was working on steemsql (http://steemsql.com/) where I think with combination of 2, you can inject Steem. Start exploring what can be done...