As you could see a few weeks ago, we opened a new column "Gallery" in our main website. It is devoted to different examples of wireframes and mockups. Our team also did a little surprise for our users. We have created wireframes of the most popular social networks. Now, if you want to do some mockups that resemble these networks or you want to play with details and try to see can you create better Facebook layout or no, just import this examples in your Mockup Builder account.