# Reddit CrosspostNet--Studying Reddit Communities with Large-Scale Crosposst Graph Networks
## 5 Selected Results Related to Past Subreddit Studies
### Relations between Subreddits Previously Analyzed in the Literature  
There have been multiple microscale researches on Reddit, studying a particular subreddits, or a group of selected subreddits. We now illustrate how analysis of crosspost-driven graph networks may be useful for researchers interested in specific subject areas. Obviously, the material presented in what follows is just a set of examples that may be generalized into a useful proposal. Two studies about social norms [27] and social morals [28] considered the subreddit r/AmITheAsshole. Checking the connections of this subreddit, in the crosspost-based graph, it was easy to spot that it is most strongly connected to two other subreddits: r/AmITheAngel (out-crossposts count: 3461, top 1% of all crossposts connections)), r/AmITheDevil (out-crossposts count: 2504, top 1% percentile of all crossposts connections)). Even though these subreddits form the most strongly connected \"semi-triangle\" (by edge weight) within the graph, the edge between r/AmITheAngel and r/AmITheDevil is missing. This makes r/AmITheAsshole the focal point of the discussion. This can be seen as a strong indicator that research reported in [27] and in [28] could benefit from taking into account not only the r/AmITheAsshole, but also co-analyzing r/AmITheAngel and r/AmITheDevil subreddits. A study focused on mental health (reported in [29]) analyzed the following subreddits: r/alcoholism, r/anxiety, r/bipolarreddit, r/depression, r/mentalhealth, r/MMFB (Make Me Feel Better), r/socialanxiety, and r/SuicideWatch. Obviously, these are focused directly on various mental health issues. However, applying the proposed approach, it was easy to realize that there is a significant number of crossposts between the studied subreddits and other subreddits, presented in Table 3. \begin{table}
\begin{tabular}{l l l} \hline \hline
**To Subreddit** & **From Subreddit** & **Crossposts Count Percentile** \\ \hline depression\_help & depression & 0.969402 \\ mentalhealth & helpme & 0.937691 \\ mentalhealth & Advice & 0.900146 \\ depression\_help & mentalhealth & 0.900146 \\ mentalhealth & depression & 0.900146 \\ mentalhealth & mentalhealth & 0.860143 \\ mentalhealth & disorders & 0.860143 \\ mentalhealth & OCD & 0.860143 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Top subreddits connections (by crossposts count percentile) for studies on mental health [29]. This suggests that the results reported in [29] could be made somewhat more comprehensive if the number of analyzed subreddits was extended by some of these that are closely crosspost-related. Here, note that a clear break point occurs after the first subreddit, next after the second subreddit, and another one after the top five subreddits. Another study, regarding stress analysis, was reported in [30]. It was based on r/stress, r/anxiety, r/homeless, r/almosthomeless, r/Assistance subreddits. Applying the proposed approach, it was established that these subreddits have a significant number of crosspost connections with subreddits shown in Table 4.  
The results presented in Table 4 show, again that the dataset used in [30] could have been expanded at least by the first two subreddits (after which a clear break can be spotted). Yet a different study was devoted to parenting communication [31]. It used r/Mommit, r/Daddit, and r/Parenting. Applying the proposed approach, it could be suggested to also take a look at subreddits in Table 5 as they are closely crosspost-related to the ones used in the original study. Here, the first two or the first five subreddits could be incorporated. Finally, a political science research was reported in [32]. It was focused on r/The_Donald, r/Conservative, r/politics, r/SandersForPresident subreddits. When crossposts are considered, this set of subreddits could have been expanded by subreddits presented in Table 6.