Deezer is the French-based service which is one of the largest and very popular music recommendation search engine. You can register there and can create your own profile and enter to the Deezer community. You can also create playlists of your own choice, send messages to your contacts, leave comments, add artists and albums to your favorites, and much more. Its best feature is that – The Smart Radio, which is an intelligent radio that generates 3 hours(!) of continuous listening based on one artist automatically – It is completely free.