Dive Brief: 

• Twitter has been reaching out to ad agencies as it looks for ways to market its platform and build its brand. 
• The social network has invited agencies to pitch creative ideas on how it could expand its marketing. 
• Because Twitter already gets a fair share of free exposure, the relationship and budget is likely to be small — something between an agency-of-record relationship and one-off project work. 

Dive Insight: 

The type of attention ad agencies could draw is likely attractive to Twitter because it could reach a less-tech-oriented crowd that doesn't already use the platform. Most savvy social media users and marketers are on Twitter, but the platform still lags behind several competitors in monthly user numbers. If Twitter could reach more of the crowd that solely uses Facebook just because of its popularity, it could seriously boost its numbers.