Over the past decade or so, social media has undergone a dramatic transformation. The social networking sites of yesteryear (think MySpace and Friendster) seem positively archaic compared to today's heavy hitters. As modern-day platforms proliferate, each one is becoming known for certain features that distinguish it from the others - image-sharing and Instagram, for instance. In connection with this evolution, they are developing markedly different audiences. Business Insider's BI Intelligence research service recently took a look at how factors such as age, education, gender and income affect people's social network use. Age Instagram, Snapchat, Tumblr and Vine all have young, loyal user bases. Nearly half (45 percent) of adult Snapchat users are between the ages of 18 and 24, while almost one-third of American teenagers regard Instagram as being their most important social network. Meanwhile, the users of Facebook, LinkedIn, Twitter and Pinterest tend to skew older, according to BI Intelligence. Overall, people between 18 and 29 years of age are still the most likely to engage in social networking. In fact, the Pew Internet Project revealed that 89 percent of these individuals used social media as of January 2014. Perhaps unsurprisingly, people aged 65 and over composed the least connected demographic, at 49 percent. Gender BI Intelligence found that men are more likely to use LinkedIn and Twitter, while women gravitate toward Facebook, Instagram and Pinterest. The gender gap is most pronounced on Pinterest, with women 29 percentage points more likely to use the pinboarding site than men. Overall, more women than men use social networking sites: As of January 2014, 72 of men and 76 percent of women had a social presence, according to the Pew Internet Project. That being said, the gap is closing. Previous research from Pew found that in May 2013, 74 percent of women used social networking sites, compared to just 62 percent of men. Income and education Eager to reach an audience of high-earning U.S. professionals? LinkedIn should be your go-to social network, as it's used by more than 4 in 10 Americans who make at least $75,000 per year. However, looking at all social networking sites across the board, education and income levels don't seem to have much of an effect on social media usage, according to statistics from Pew. Do any of these statistics surprise you? Do your own social networking habits mirror those of your demographic?