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The domain your certificate protects depends on the certificate you buy. A typical certificate only protects one domain (or subdomain). When you setup SSL for a domain, you have the option to use http:// or https://. Your domain is not automatically redirected to https://, so you will have to do that manually. Yes, you should definitely use SSL for a social media site.

You will have to create the subdomain for each parked domain separately. Although parked domains display the same content, the DNS records for each domain are kept separate.

1. You can use addon domains to have your .com domain display different content than that of your heliohost.org subdomain. 2. The domain change script changes the main domain of your account (currently your heliohost.org subdomain). By changing that to your .com domain, you will lose your heliohost.org subdomain. The only way to retain your heliohost.org subdomain is to leave it as your main domain. 3. Addon domains are used to display content different from your main domain and parked domains. To have a third (or more) domain display the same content as your heliohost.org subdomain and parked .com domain, simply add it as a parked domain. On HelioHost, there is no limit to the amount of parked and addon domains you may have.