Facebook was the most popular site for B2C marketers, with 65% reporting that they spent money there. Only 40% of B2B marketers said the same of Facebook. However, 39% of B2B marketers spent money on LinkedIn, compared to only 23% of B2C marketers. Greater percentages of B2C marketers were using Twitter, Google+ and Pinterest than were B2B marketers. However, the difference for Google+, which has been popular for technology conversations in particular, was only 3 percentage points. Read the rest at eMarketer.