Pligg

Pligg is an open-source CMS written in PHP, built for creating social news sites — portals where the community submits content and decides its visibility through voting. It was popular during the heyday of Digg-style sites.

How Pligg works

Its principle rests on bottom-up content curation. Registered users submit links to articles with a short description and then cast votes on them. Submissions with the most positive votes graduate from a queue to the front page, where they gain the most attention. All of the mechanics — accounts, votes, comments and publication order — are stored in a MySQL database.

The script offered features typical of such portals: topical categories, comments, anti-spam systems and templates and modules for customizing the look and logic of the site. Thanks to its open code, the community produced its own extensions and themes.

Practical application

Pligg was used mainly to launch niche link aggregators and industry portals driven by community engagement. The voting model let the most interesting content surface without top-down editing, which made it attractive for community projects and SMO activities.

As a classic PHP-plus-database application, Pligg ran on typical shared hosting or a VPS. It is worth noting that the project is no longer actively developed, so new deployments tend to consider more modern, supported alternatives offering a similar vote-driven publishing model.

A lack of active development also means old Pligg installations may contain unpatched vulnerabilities, so sites still built on the script demand extra caution — environment isolation, an up-to-date PHP version and reliable backups. For new social news projects, solutions with an active community and regular security updates are the safer choice today.