Here’s the graph of top 15 social networking sites in the world. As you can see Facebook is leading the pack with a huge margin in front of You Tube. Then there’s another gap of similar size to Instagram on the third place.
NEW: Instagram has now 1 billion users. That is the answer to the question, what will be the next big thing.
Here is the most up to date list of monthly active users for the top social networking sites. If you want the numbers just scroll down. First, you’ll find top social networking sites followed by top 10 apps.