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eXO is a completely decentralized, scalable system that offers fundamental social networking services. We describe the architecture of eXO and its key components which encompass (i) techniques for content indexing, (ii) novel algorithms for ranked retrieval, (iii) appropriate similarity definitions that consist of a 'content' and a 'social' part, (iv) novel algorithms for efficient distributed content retrieval, (v) novel techniques that efficiently and scalably facilitate tagging and exploit tags to enrich query results, and (vi) novel scalable methods which permit the creation of personal networks, which allow for more ``intimate'' sharing and associations between users. A short video demonstration of the basic functionality is available [here].