Abstract: Methods, systems, and apparatus include computer programs encoded on a computer-readable storage medium, including a method for providing content. The method includes anonymously linking at least two different identifiers associated with two different requesting sources. The linking uses an identifier that does not include any personally identifiable information. A request is received from a user to create a bookmark for a resource that was presented on a first device having an associated first identifier. The bookmark or a reference to the bookmark is stored. Bookmarks associated with the user are synched across multiple requesting sources using the anonymous linking. After synching, a request to access saved bookmarks is received from a user when accessing a second different device. Based at least in part on the synched bookmarks, the bookmark is provided, or a link to the bookmark is provided, enabling presentation of a resource associated with the bookmark.

Abstract: A network provider can receive a request, via a first mobile device and a mobile wireless telephone network, for access to a wireless network secured with at least one encryption key and implemented by at least one wireless access point. In response to the request, the network provider can associate the first mobile device with a user account of a user and can provide a token to a registrar and to the first mobile device via the mobile wireless telephone network. The registrar can receive, from the first mobile device or a second mobile device associated the user via the wireless access point. After determining, based on the one or more hash values, that the first or second mobile device has possession of the token, the registrar can provide the encryption key to that mobile device.