Twitter announced that they now offer more targeting options for your Twitter Advertising.

Target by interests: by @usernames and interest categories

  • · Target @usernames, to build an audience with similar interests to that @username’s followers.
  • · Choose from a wide-ranging list of 350 interest categories.

Target by device 

  • · Tailor your content to reach users on laptops, desktops, tablets or smartphones.

Target by gender

  • · Target by gender when you want to reach just the guys or just the gals.

You can get more details here http://app.tweet.twitter.com/e/es?s=1259914507&e=6448&elq=13c102ec32b14036a12644ce30de53bf