Build a website where people and companies can "support"

* Reference: [login to view URL] * Brief: We are a non-profit organization that wants to launch a petition-like website for a cause where you can "support" our initiative by signing up. * Functionalities: - People can show their support by signing up via Linkedin, Facebook or Twitter - Image and name are imported from people's social profiles - The person has the ability to write us a comment (not visible in front-end) - The site shows a list of people who signed up with a counter (see reference above) - We have the opportunity in the backend to manually add companies and their logos - or at least a WYSIWYG part that we can edit (yes, we can write simple HTML/CSS) We want the fastest and most cost-effective option. We do not need any advanced front-end work, but only a simple one-pager with these functionalities in place. For this we propose, for example, Wordpress, other standardized CMS or building own.