Obviously take this with a grain of salt, but da Google™ shows "about 7,730,000 results" with the words powered by phpBB. If we take an approximate value of 1,200,000,000 websites in the entire world, phpBB's market share using the results above is around 0.6%. Keep in mind that this number would include ALL websites, not just websites powered by forum software.
Statistics: Posted by Kailey — Tue Mar 25, 2025 2:33 pm