Don't think of a platform: First think of your goal, then select a platform.

If you're a startup and you want a branded official news source then it's hard to beat a WP install on your own domain. Can you use another platform? Sure you can, but don't over think it because you should be working on your product.

If you're looking to reach a community, then think about who is the community that you want to reach? Then pick the platform based upon that. Want to meet tech geeks into Android? Well G+ seems to be the place. Want to meet hipsters who love to swap images images? Tumblr seems to be a good place for that. So play on the playground where you want to make some friends.