Since the default for software under copyright law is "All Rights Reserved", it would be great if you could place the ThreadTree code under an open source license.
Since ThreadTree is a network service, I would suggest to choose the GNU AGPLv3, which aims to ensure that users of the service can get access to the code behind the service, so that they can run the code themselves, for privacy, or if the service went down etc.
Since the default for software under copyright law is "All Rights Reserved", it would be great if you could place the ThreadTree code under an open source license.
Since ThreadTree is a network service, I would suggest to choose the GNU AGPLv3, which aims to ensure that users of the service can get access to the code behind the service, so that they can run the code themselves, for privacy, or if the service went down etc.