# The Application of Blockchain in Social Media: A Systematic Literature Review
## 4 Methodology
### Data Selection Process  
Initially, we recovered 6762 articles from eight databases. The returned results from the most to least were as follows: Science Direct, 2211 items; Wiley Online Library, 1097; Scopus, 721; IEEE Xplore, 708; EBSCO, 583; Web of Science, 517; ProQuest, 463; and ACM digital library, 453. All references found during the search were collected. Duplicate items were subsequently removed using the Endnote reference manager. The screening procedure and ultimate choice of whether to include a study were shared between two people. While a single screening can use time and resources more effectively, there is a higher risk of missing the relevant research content. A double screening may vary from repeated examination of all records (examined independently by two investigators) to merely inspecting the result. Any divergence of opinion about a paper's qualification was handled after deliberation with the third author, who aided with the choice phase. This helped to keep any risk of bias within reasonable limits. This method can filter irrelevant records while auditing subsequent steps to improve audit efficiency. Subsequently, after the duplicates were removed, two authors directed the eligibility conditions by checking the title, abstract, and keywords in light of the research questions and debated which studies should be used for the next filtering. When a decision about inclusion or exclusion was not straightforward, the whole document was thoroughly analyzed in order to make a final inclusion decision with reference to the eligibility criteria. After the initial screening phase, 846 papers were left, of which 804 were subsequently excluded. As a result, 42 items qualified for inclusion. The process used for screening and selection is shown in Figure 3. \begin{table}
\begin{tabular}{l c} \hline \hline
**Database** & **Query Strings** \\ \hline Scopus & TITLE-ABS-KEY ((”Blockchain” OR “Blockchain platform” OR “Blockchain application”) AND (“Social media” OR “Social network” OR “Social platform” OR “Online community” OR “media platform”))) \\ \hline Web of Science & TS = (((”Blockchain” OR “Blockchain platform” OR “Blockchain application”) AND (“Social media” OR “Social network” OR “Social platform” OR “Online community” OR “media platform”))) \\ \hline IEEE Xplore & (“All Metadata”: blockchain OR “All Metadata”: blockchain platform OR “All Metadata”: blockchain application) AND (“All Metadata”: social media OR “All Metadata”: social platform OR “All Metadata”: media platform) \\ \hline \multirow{4}{*}{ACM digital library} & [[All: “blockchain”] OR [All: “blockchain platform”] OR [All: “blockchain application”]] AND [[[All: “social media”] OR [All: “social media”] OR [All: ““media platform”]] AND [[[All: “social media platform”]] OR [All: “social media”] OR [All: “social media”]] AND [[[All: “social media platform”]] OR [[All: “social media”] OR [All: “online community”] OR [[All: “online community”]] OR [[All: “online community”]] OR [[All: “online community”] OR [[All: “online community”]] OR [[All: “social medium”]] OR [[All: “media platform”]] \\ \hline ScienceDirect & ((”blockchain” OR “blockchain platform” OR “blockchain application”) AND (“social media” OR “social network” OR “social platform” OR “Online community” OR “media platform”)) \\ \hline Wiley Online Library & “(blockchain OR blockchain platform OR blockchain application) AND (social media OR social network OR social platform OR online community OR media platform)” anywhere \\ \hline EBSCO & (“blockchain” OR “blockchain platform” OR “blockchain application”) AND (“social media” OR “social network” OR “social platform” OR “online community” OR “media platform”) \\ \hline \multirow{4}{*}{ProQuest} & ti(((”blockchain” OR “blockchain platform” OR “blockchain application”) AND (“social media” OR “social network” OR “social platform”)) OR \\  & ab(((”blockchain” OR “blockchain platform” OR “blockchain application”) AND (“social media” OR “social network” OR “online community” OR “media platform”))) \\ \hline \hline \end{tabular}
\end{table}