Design a Facebook landing page

Hello i am getting ready for the launch of my web app that will take place in may but i want some graphic designs for my social media networks as follows: 1. Facebook cover page plus resizing logo for facebook 2. background cover for twitter + resizing logo 3. background cover for you tube and resizing logo 4. background cover for google + and resizing logo 5. Linkedin cover page + resizing logo 6. Instagram cover page + resizing logo Note that the concept is for a classified website in Rwanda, so here concept will be the same for all above points apart from dimensions which will be changing regardless to which platform they will be used for.