Following are recent findings by various studies on marketing and advertising-related topics. For a more in-depth look at some of these subjects, visit our sister site, MarketingCharts.com.

LinkedIn the Top Tool for Marketers

Almost nine in 10 companies use LinkedIn as part of their social media strategy, according to a new study from King Fish Media, Hubspot and Junta 42. The study found that 87% of companies currently use LinkedIn as part of their social media strategy, 84% use Twitter and 78% use Facebook.

North American Mobile Video Adoption Low

North Americans are less than half as likely as the global average to watch online video via mobile device, according to a new study from The Nielsen Company. North America only scores 45 on the Index of Mobile Video Usage - with 100 representing the global average. Europe also lags the global average with a score of 55. Asia-Pacific consumes the most online video at 145, followed by Middle East/Africa/Pakistan at 136 and Latin America with a score of 118.

Google Slightly Loses Explicit Core Search Share

Google Sites led both the explicit and total core search markets in July 2010, according to comScore qSearch data, with 65.8% market share, down 0.4 percentage points from June 2010. Yahoo Sites followed with 17.1% (up 0.4 percentage points) and Microsoft sites with 11%. Ask network captured 3.8% of explicit core searches, followed by AOL LLC with 2.3%.