Effective advertising measures according to SMEs in the United States 2016

Which of the following advertising measures would you consider effective for small and medium-sized enterprises?

The data displays the advertising measures considered to be effective among small to medium sized enterprise (SME) owners in the U.S. as of November 2016. During a survey, 19% of responding SME owners said that they considered outdoor advertising to be an effective advertising medium for their sector.

Social media advertising 65
Online advertisements posted on search engines 51
Direct advertising/mailings 40
Print advertising 34
Online advertisements posted on external websites 31
Content optimized for mobile devices 23
Outdoor advertising 19
Radio advertising 15
Television advertising 12
Other 3
Don't know 10