Instagram has announced via a blog post they are (probably) larger than Twitter. Their service has grown to well over 300 million users, but the real story is how many are using it. According to Instagram, they have a monthly active user number almost as high as their overall user metrics. At 284 million users monthly, they’ve likely outpaced Twitter. Put that way, it’s easy to see why Twitter recently copied the very thing people like about Instagram, rolling in the same filters and ease-of-use.