As social photo and video sharing site Pinterest continues to dominate social media blogs for good reasons and bad, its growth has brought it under the scrutiny of bloggers and users alike. Friday, they made 4 major changes to their terms of service that address two major known issues and that preempt two potential issues in the future. Their biggest challenge of late is addressing the speculation that they’re a copyright- and trademark-infringement haven. They have attempted to head in the right direction by making the tools and ability to report allegedly-infringing content more easily….