Hi Guys,

I am thinking of building (or have it build) a social networking site with the possibility of back end management just like CMS, site administrator can add/modify things on the sites etc.

Plus I am also looking for plugin/widget container inside it, so developers/enthusiasts can add plugin or widget paid or free on the site to enhance existing features.

What technology you suggest can help it develop in quick time, I need a honest opinion and what can it cost me any suggestions/pointers.

I'm not quite sure I understand what you are looking for, you'll have to elaborate much more on the specifics and provide some examples. But for what I understand you are talking about a complex platform, which can be developed with any server side coding languange (like ruby, php, python). In terms of cost: 10+ thousand if it's made from scratch.