My client wants a website that sells social media followers. How can I build a website like this? Here is an example website: https://boostgram.com I know the following languages: HTML CSS jQuery PHP MySQL
I want to build my website myself. I know how to build a login system but the problem is ... Where do I get the likes from? Is it like advertising where there is publishers and advertisers?
Such services are based on scripts which are offering other users to like, share, follow the profiles/pages. You may try with a likes exchange website.
What do you mean where do you get the likes from? You need to either outsource it or get it yourself by setting up accounts on social media sites.