Link building is another SEO strategy that you can use to your website's advantage. But due to its nature of being involved with several websites, you need to be able to clearly identify the best places where you can possibly make your links visible to people. In this day and age, link building has proven itself more credible than ever because of the many different portals now available for doing link building. To help guide you on this journey, here are some of the best websites where you can do link building:Social Media - Ever seen those links on the end of an article? Reddit, Delicious, and Digg? These are just some of those social bookmarks that can be used to tag your articles. Link building makes these tags available to these social media sites where other people can freely share and pass it around as well. This is a great way to create instant traffic into your website and it's also a free strategy that you can implement.Email marketing - You can also use those contacts you have gained to create an opt-in list where you can send your marketing collaterals. E-Newsletters are usually the kind of collateral being sent on through email and since you don't really want to overwhelm people with text, you can use a number of links inside these newsletters. You can use it as way to populate traffic across your web pages.Guest posts - If you also want to create more links for your website elsewhere, doing guest posts is another thing you can develop. To do this, tie ups with other websites or blog sites is crucial. This might also require creating networks online. Or you can also try to pick up some websites which contain content that is relevant to your business. You can start by commenting on the post and then eventually linking a response that can be found on your web page. Just be careful not to end up spamming the comment section.Article directories - You can also create links by posting various contents in article directories which contain links that can be traced back to your website. You should just be more aware with the fact that article directories may not always allow you to link without pay. Some might appear as a free portal for creating your articles but if you want to create links, they may already charge you an extra to make that possible. So better choose which article directories you would deal with.