Using an omni-channel strategy is becoming increasingly important for enterprises who must adapt to the changing expectations of consumers who want ever-more sophisticated offerings throughout the purchasing journey. Retailers are increasingly focusing on their online presence, including online shops that operate alongside existing store-based outlets. The "endless aisle" within the retail space can lead consumers to purchase products online that fit their needs while retailers do not have to carry the inventory within the physical location of the store. Solely Internet-based retailers are also entering the market; some are establishing corresponding store-based outlets to provide personal services, professional help, and tangible experiences with their products.[24]
You can place the opt-in form on the landing page or an optin page that allows your visitors an easy access to it. The most common place to position your opt-in form is on the top of the sidebar of a an optin page, above the fold so that it is one of the first things that your visitors see and also so that they don’t have to scroll down to access it.
The huge advantage of email over social media is that prospects and customers are more likely to see an email than social media. Just posting something doesn't mean that everyone you want to see your message will see it. Your post might not even show up in your targets' social media streams. However, an email will sit in the inbox until it's read (or deleted).
Giving users the option to manage their subscription gives them the choice to opt down instead of completely out – this way you still keep your customers and they’re happy receiving your emails on their terms. When first building your list you should also provide users with a double opt-in option to ensure they are completely happy receiving emails from you.

