keyword search in sites

I am planning to build a small social networking site. What is the best way to support keyword search in the content. I am looking for an opinion considering the fact that the con开发者_如何学编程tents can grow few TBs in size.

thanks, GL

You should definitely use Solr/Lucene to index contents resulting in efficient keyword search results and it is also very easy to implement a faceted search based on Solr if you have such a feature in your mind.

Have you looked at Apache Lucene? It's a high-performance, full-featured text search engine library written entirely in Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform.