When it comes to social networking, growth is everything. After all, if you don’t have an audience to use your services, what’s the point Fortunately, sites like Pinterest and Instragram are certainly showing some growth — but Tumblr is leading the charge.

A report posted by TechCrunch {link no longer active} shows that Tumblr has the highest amount of growth in terms of social audience, with a 120 percent increase in active users over the previous year. While the number of members is a bit lower at 45 percent, there’s no question that it’s getting far more use.

Meanwhile, Pinterest isn’t far behind, showing a 111 percent growth (with 57 percent from members), and Instagram is in third with 64 percent (with 36 percent from members). Hitting lower numbers are Twitter with 18 percent growth (26 percent in members) and Facebook with six percent (and two percent from members). However, keep in mind these are all positive numbers, with barely any drop in users. The chart below shows the growth for each company, including some interesting numbers for Google Plus.

Tumblr also hopes to expand its audience with the introduction of buy and view buttons, which can be viewed here. With these new functions, bloggers can post links from Kickstarter, DoSomething and other sites, enabling users to see products and pick them up with the simple push of a button.

Leading back to numbers, when it comes to growth with specific teen and 20-something audiences, it appears that Snapchat has the highest, with a 56 percent increase over the previous year. That’s followed closely behind by Facebook Messenger, which shouldn’t be a surprise since the company installed it as its separate app on mobile devices earlier this year. Instagram, Line and Pinterest round out the top five, while Facebook, Foursquare and Tumblr are on the bottom, ranging around 25 to 30 percent — which still isn’t bad.

However, there is some cause for concern with Facebook, according to Jason Mander, head of trends and author of the report. “Facebook has some major challenges to face,” he said. “Firstly, people are growing tired of it, with 50 percent of members in the UK and U.S. saying that they’re using it less frequently than they used to (rising to 64 percent among teens).” He says that the stats appear to show people using Facebook much more passively today than in the past: “Since the start of 2013, we’ve seen behaviors like sharing photos and messaging friends fall by around 20 percentage points.”

Meanwhile, the report also explains that while mobile use of social apps is on the rise, they haven’t overtaken PC and laptop usage just yet. Six out of ten users still access social networks using some form of computer, while 4 in 10 use mobile devices. However, considering the growth of the mobile market, don’t be surprised if you see this change up over the next few years.

More details on the report can be found here {link no longer active}.