Bots account for a significant percentage of Twitter followers for high-profile users such as Obama, Romney and members of Congress.

Twitter lists — launched by Twitter in 2009 — are curated groups of Twitter users. They are manually collected and can be set as private, so only one user sees them, or public, meaning others can follow the same list. Lists are a means of creating order and slowing down the chaos of real-time information flowing via tweets, and typically if a user is monitoring a list they are more likely to see the list members' individual tweets.

In this case, Obama’s influence on Twitter still trumps Romney’s, whether measured through followers or lists. The president has 178,641 public lists following his official Twitter handle, while Romney has 12,773, Advocacy Media found. The combined number of users following those lists gives Obama an even greater lead on the GOP nominee, with 1,680,596 to 8,302 public list followers.

Advocacy Media used to collect and analyze data from Twitter, and broke down recurring keywords gathered from the list names to create the infographic below.