Like many of the sites on the list, Bo.lt looks a lot like Pinterest with its big images and grid-like design. However, the idea behind Bo.lt is to save whole web pages and written content in a new way that means you won't ever be greeted by 404 errors or re-directed elsewhere. According to Mashable the site is foolproof: "When you "bolt" a page, it is stored on the company’s servers, so that even if the page is later taken down from a site, you still have it." As you'd expect, you can follow other 'bolters' and browse different categories. You begin by adding a 'bolt it' button to your browser, then when you stumble across a page you want to keep you can write a little blurb about why the content is worth saving, give it a category, assign a photo to the bolt and even add hash tags and things to make it easier for other members to find what they're looking for. Bo.lt is really clued up when it comes to online sharing, you can post immediately to Facebook, Twitter and (interestingly) Pinterest and there's a 'bolt it' widget for bloggers too.