Table - US Telecom Industry Online Ad Spending, 2011-2017

These companies—many of which are among the country’s largest and most innovative advertisers—are also experimenting with new ad formats and content sponsorships aimed at strengthening brand loyalty while retaining and upselling existing customers.

eMarketer expects such efforts will help push US telecom industry digital ad spending to $4.82 billion in 2013, and up to $6.69 billion by 2017. Read the rest at eMarketer.