When you visit the platform for development commuity of twitter is it empowered by acquia the platform is using drupal technology. We can recognized that drupal is so powerful that twitter choose the best advance platform that can scale the large amount of development community.
Drupal has level up into advancement community everyday because it has supported with the large numbers of development in drupal.org . We can expect the growth will continue to explode in power of exponents. Also we can expect numbers of training and education will increase in powers of multiplicity.