## 2 Materials and Methods
\begin{table}
\begin{tabular}{c c} \hline \hline
**Categories** & **Tools** \\ \hline \multirow{6}{*}{2.1. Connectivity (asymmetric two-way)} & \multicolumn{1}{c}{Subscription forms for content syndication} \\  & \multicolumn{1}{c}{(social media/newsletters)} \\ \cline{2-3}  & \multicolumn{1}{c}{Intranet registration} \\ \cline{2-3}  & \multicolumn{1}{c}{Web search engine} \\ \cline{2-3}  & \multicolumn{1}{c}{File download} \\ \cline{2-3}  & \multicolumn{1}{c}{Members’ area} \\ \hline \multirow{6}{*}{2.2. Sharing (asymmetric two-way)} & \multicolumn{1}{c}{Button/tool for tagging or sending information} \\  & \multicolumn{1}{c}{to external sites} \\ \cline{2-3}  & \multicolumn{1}{c}{Button/tool for sharing on social networks} \\ \cline{2-3}  & \multicolumn{1}{c}{Content personalization (follow favorite} \\  & \multicolumn{1}{c}{authors, posts, etc.)} \\ \cline{2-3}  & \multicolumn{1}{c}{Surveys} \\ \cline{2-3}  & \multicolumn{1}{c}{2.3. Reviewing/commenting} & \multicolumn{1}{c}{Option to leave comments on the website} \\ \cline{2-3}  & \multicolumn{1}{c}{(asymmetric two-way)} & \multicolumn{1}{c}{Blog allowing user responses} \\ \cline{2-3}  & \multicolumn{1}{c}{Option to evaluate or rate web content} \\ \cline{2-3}  & \multicolumn{1}{c}{Shop section} \\ \cline{2-3}  & \multicolumn{1}{c}{Signing users’ petitions} \\ \cline{2-3}  & \multicolumn{1}{c}{Section for requesting to attend events in} \\  & \multicolumn{1}{c}{person or online} \\ \cline{2-3}  & \multicolumn{1}{c}{Enquiries section} \\ \cline{2-3}  & \multicolumn{1}{c}{Online section for offering support, donations,} \\ \cline{2-3}  & \multicolumn{1}{c}{or sponsorship} \\ \cline{2-3}  & \multicolumn{1}{c}{Suggestions section} \\ \hline \multirow{6}{*}{2.5. Collaborative (symmetric two-way)} & \multicolumn{1}{c}{Forums (online discussion sites)} \\ \cline{2-3}  & \multicolumn{1}{c}{Section for collaborating as an online expert or volunteer or for uploading content (co-creation of web content)} \\ \cline{2-3}  & \multicolumn{1}{c}{Source: authors’ own compilation based on [PERSON] et al.’s work [28].} \\ \cline{2-3}  & \multicolumn{1}{c}{} & \\ \cline{2-3}  & \multicolumn{1}{c}{} & \\ \cline{2-3}  & \multicolumn{1}{c}{} & \\ \cline{2-3}  & \multicolumn{1}{c}{} & \\ \end{tabular}
\end{table} 
Table 2: Types of two-way (dialog) tools used on NGO websites. Lastly, it is worth noting that a representative sample was studied, consisting of the 30 most influential and important NGOs in the world according to a combination of the Top 20 International NGOs worldwide [46] and the 15 Biggest NGOs in the World rankings [47]. The difference between the top \"20 international NGOs\" and the \"15 largest NGOs\" lies in the selection criteria: the former are selected because of their global reach and impact, while the latter might be based on factors such as size, budget, and geographic scope. It is logical that some NGOs appear on both lists, as large NGOs are generally international due to their capacity and resources. Accordingly, the overlaps of organizations between the two classifications have been eliminated to avoid duplication, resulting in the list presented in Table 4.