New research released by analyst group Piper Jaffray suggests that twice as many teens now own iPhones than in the fall. The survey of nearly 400 teenagers found about six percent were iPhone owners, with another nine percent planning to purchase one in the next sixth months. The survey also found overall use of MP3 players at a record 87 percent, with 86 percent of MP3 player owners saying they have at least one iPod. A video posted to YouTube over…