The newest update of Shazam for iPhone lets you share your tags on your Facebook timeline.

Lightning fast tagging. Now discover, explore and share more music, TV shows and brands you love in as little as one second.
With unlimited tagging use Shazam™ as much as you want, and experience more of what you like, faster.
Download and experience the 9th most downloaded app of all time.

You can also:

○ Use Shazam during American Idol to get the song lists, buy the music & more (US only)
○ Save & listen again (30 sec preview)
○ Buy tracks easily on iTunes & find more by tagged artists
○ When you see the Shazam prompt on TV, tag for extra content
○ Watch music videos & concerts from YouTube
○ Share on Facebook, Twitter & email
○ See streaming lyrics in time to the music
○ Discover new music in Shazam Friends & Charts
○ See when an artist is touring
○ Store tags and submit when you next have a signal