A US consumer poll done in the second quarter of ’08 found that 75 percent of Internet users participate in some form of social media, up from 56 percent in 2007.

Adoption rates vary by the type of activity. For example, Forrester found large growth in participation among those reading blogs and writing product reviews. “Spectator” rates jumped from 48 percent to 69 percent. Likewise, those identifying themselves as “critics” increased from 25 percent to 37 percent.

Yet other areas saw more modest increases. Maintaining RSS feeds and tagging Internet content remain far from the norm. Just 19 percent fell into that “collector” category, up from 12 percent a year ago.

Rates of content creation have slowed considerably. Those publishing a blog or personal Web page saw incremental growth: 21 percent versus 18 percent. In fact, blogging grew just 10 percent, well behind the 39 percent growth in starting a social network profile. Still, blogs remain a highly popular form of social media: 48 percent of respondents said they have read one, a nearly 50 percent increase

from 2007.

In another sign that social media has gone mainstream, Forrester found the participation gap narrowing among age groups, though younger demographics still rate higher. Forrester found 35-44-year-olds increasingly entered the ranks of critics, joiners and spectators.