Piki is a combination of social media and music radio streaming. It is user friendly and free. To sign up, users just need to enter a username, password and email address.
Viewers pick a song they like and are given a list of people they now follow based on similar music interests. I found my matching to be hit or miss. I entered "Little Black Submarines" by the Black Keys, an indie rock band. I was matched with people that liked other bands within that genre. I was also matched with a few people who did not have similar music tastes. A couple of my matches, primarily listed rappers for their music preferences, a big reach from the song I had entered.
Instead of just following strangers that are matched for you by the site, you can invite friends by sending them an email invitation or linking the site to your Facebook, Twitter or Turntable. This way even if the music Piki recommends to you doesn't exactly match your tastes, your friends can send you suggestions. After all, they're the ones who know you best.
The site provides a feed of updates that mimics a social media site. The feed notifies the user whenever people follow them, re-pick a song they have picked, or dedicate a song to them.
Review: Molli Ferrarello