A few items to pass along on the social media front: one relating to a local event and another to new reports from the Pew Research Center.

Maryville University announced today that it is hosting a conference on social media for the American Marketing Association’s St. Louis Chapter. The event’s theme is “The New Decade of Social Relationships,” and among the scheduled speakers are Brad Hogenmiller of the Social Media Club of St. Louis, and representatives from MasterCard and Southwest Airlines, who will talk about their experiences using the tools of the web to reach customers.

The event takes place Feb. 26 from 7:30 a.m. to 12:30 p.m. on the university’s campus. Information on registration can be found here. Maryville is also hosting a conference on Feb. 19 that’s directed at students who are interested in the public relations field. More information on that event is here.

In other news, Pew’s Internet and American Life Project is out with surveys showing that blogging among teenagers and young adults is on the wane but is rising in popularity among people over 30. The report finds that 14 percent of teenage internet users say they currently blog, down from 28 percent in 2006. Roughly one in 10 adults who have internet access maintain a blog or personal online journal, according to Pew.

The results also show that internet use and social network use in particular continue to increase for the under-30 set. Ninety-three percent of teenagers ages 12-17 go online, as do 93 percent of young adults ages 18-29. These remains the groups that are the most frequent web users.

Nearly three-fourths of wired American teenagers now use social networking sites, up from 55 percent in 2006 and 65 percent in 2008. (Facebook, not surprisingly, is the most popular site.)

Teenagers are not using Twitter in great numbers, according to the report. But, apparently, high school-aged girls show the greatest enthusiasm for the microblogging service.

The surveys are part of Pew’s series that highlights attitudes and behaviors of the so-called Millennial generation.