30 Largest Social Bookmarking Sites In 20241. StumbleUpon / Mix Mix, previously known as StumbleUpon is one of the most popular social bookmarking sites. You can save all the links that you want to save on this platform. To sign up for an account on this platform you can use your Gmail and Facebook and Twitter credentials. There are no charges to use the platform. You can save photos, videos, and many different media forms across a myriad
