While there are a few hundred or more, if not lac, these top 100 social bookmarking sites are really the only ones you need to gain immediate submission. Be careful not to overdo it though. Going overboard will flag the major search engines and the value your links.
All sites you make with Mobirise are mobile-friendly. You don't have to create a special mobile version of your site.
Mobirise offers many site blocks in several themes, and though these blocks are pre-made, they are flexible.