Our social network (written in php) needs a recommender system script written. The recommender system will basically recommend items of interests to users based on a few factors. The factors will allow us to have a level of flexibility to allocate weight to each factor.
We think the best algorithm may function similar to collaborative filtering, but are open minded to other recommendation algorithm.
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If you have experience in recommender system, please share with us (a demo is always appreciated). We can provide you with resources needed.