(Source: via  Gadling.com)

Some interesting observations:

• According to authors , Southwest drops to second place this month as industry giant Delta (21,000) mentions, leaps into first place. It’s interesting to note that this data is based on tweets and opinions in a category of interest, not number of followers.
•  @SouthwestAir still wins that battle, with 1,142,579 followers vs. 206,201 for the main @Delta Twitter.