Today When we talk about social media promotion we required so many thing and Website is one them to start your promotion. we know why website is important ? with the help of website we can show our company profile, Services or Product thats and its 24 hour available on internet anybody can see your company profile without disturbing you.
When we starts social media promotion campaign then if our customer see our ad on feed section on Facebook or Linkedin where your user will see the detail because on your ads campaign there can not be full detail you have to drive your user on some landing page with full detail thats why website is required.
If you are selling some products then you can show some detail and one image when they click then you have to show another detail with multiple images.
Same for Services when you are running a campaign for you services then your have elaborate your services then it need a landing page because social media campaign not provided option for more content and detail so we need website.
When your campaign will stop then your audience who knows your name where they will go again for booking or another information so it need website for long term.