I've just got the domain name and webhosting service but I need time to build up a complete website. However, during these period, I want to be contact with potential customers. The best way for me is to show a 'Under Construction' page with email, telephone communication or other social details (e.g. facebook, twitter,...etc.) So when potential customers go to our website, at least they know our website will be published very soon and at the same time they can contactl us for further information rather than just see a domain registration page.