# The Application of Blockchain in Social Media: A Systematic Literature Review
## 6 Discussion
### Research Question Answers
The model uses ciphertext-policy attribute-based (CP-ABE) encryption and bloom screen to help users find friends. [PERSON] et al. [68] proposed BCOSN, a blockchain-based architecture for a decentralized OSN (Online Social Network). It considers the blockchain as a reliable server to execute the services that are deployed by central servers in traditional systems. [PERSON] et al. [70] customized a sharding architecture to boost their model's scalability while using a blockchain model to guarantee the veracity and uniformity of content and a character-based authority control system to enhance the safety of the model. [PERSON] et al. [71] introduced DEPLEST, an algorithm for the protection of users. A user can coordinate a certain number of securitized materials after joining to the social network, with the number of items relying on the workstation's ability during the process. [PERSON] et al. [76] presented a resource request transaction structure allowing users to trade content among community members. Suppose a user wants to obtain articles from a community. In that case, the user could make a request of a group inside the community via blockchain during the time the members freely discuss the arrangement. The structure allows community groups to distribute articles via smart contract by offering a motivating network. [PERSON] [80] introduced a system providing users with control of access to information and value creation via social network site dealings named BEV-SNS (blockchain-enhanced version of social networking sites). [PERSON] et al. [81] utilized a blockchain-based identity approach to boost safety and availability, and proposed the blockchain to improve the safety and accessibility of e-government facilities such as e-ID. Validating a KYC (know your customer) operation on a blockchain can address the problem of an identity earner tracing the exchanges of an operator within the facility structure. By employing several character earners, the operator has the option of obstructing illicit tracing and describing any attempts. [PERSON] et al. [82] made a DAPP (decentralized application) on the Ethereum blockchain employing smart contracts and IPFS (Interplanetary File systems). The IPFS can help maintain a considerable quantity of items, decreasing the Ethereum storing constraint. [PERSON] et al. [83] introduced a blockchain-based academic social network system called RPchain with the goals of providing irreversible peer review archives, status tracking, and suitable drives for data storage. They suggested a new consensus algorithm, PoRe (proof of reputation), that uses the status of members for consensus. [PERSON] et al. [84] presented a privacy-preserving algorithm to maintain the confidentiality of material. The model deployed a blockchain to conserve clients' public keys in the system. The utility of a public key is to help check the client's identity and block hostile incursions. [PERSON] et al. [86] introduced Ushare, a user-centric blockchain-reinforced social media platform that allows clients to manage, track, and preserve all articles they exchange. This model contains four main mechanisms: a blockchain, a hash table with encoded data exchanged by a client, a Turing-complete connection system to manage the large amount of exchanges achieved by the client's friend group, and a local individual credential authority to handle the client's groups and encode content to be exchanged before it is disseminated inside the system. (c) Protecting Data Privacy and Detecting Fake Contents  
[PERSON] et al. [54] introduced a trust index model to preserve data privacy and avoid bogus content and deepfakes. Their proposed system uses a blockchain to generate a new structure to find the origin of contents, identify deepfakes, and estimate creators'integrity through a trust index. The decentralized privacy structure, consensus algorithm, and smart contract features of the blockchain are applied ro ensure the tamper-proofing, immutability, and traceability of content.