Every year in the break between Fall and Spring academic semesters, tens of thousands of scholars from across the world descend on an American city for several caffeine-fueled days of panels, receptions, job interviews, and social networking. Actually, this happens more than once, as members of the American Historical Association, the Modern Language Association, and the American Library Association all meet in January. And while most of their social networking happens face-to-face, some of it happens on Twitter where enterprising digital humanists armed with Martin Hawksey’s TAGS can collect conference tweets and analyze them for fun and profit.

Posts in this (intended) series include (and will be linked as they are published):

- Global Networks Stats
- Bipartite Network Analysis
- Directed Network Analysis
- Preliminary Conclusions (TL;DR)
- The Methods Post

So without further ado, here are some initial stats about the networks I constructed from the three official conference Twitter hashtags: #aha17, #mla17, and #alamw17.

The AHA network is the smallest at **2,826 nodes** (people who either tweeted or whose twitter handle showed up in another person’s tweets) and **6,945 edges** (connections generated by said tweets). These edges have been *weighted* so that if Person A mentions Person B 14 times in tweets, the edge from Person A to Person B has weight 14. If Person A mentions Person C only once, the edge from Person A to Person C has weight 1. The **average degree** **is 2.5** (number of edges divided by number of nodes) but when weight is factored in (edges are multiplied by their weight before added and divided by number of nodes) the **average weighted degree is 3.9**.

There are **74 connected components** (subnetworks with no connection to the rest of the network), with the **largest connected component containing 90% of the nodes and 96% of the edges** in the overall network. This component has **diameter 10** (the shortest distance between two people furthest away from each other) and **average path length 4.3** (average of the shortest distance between every pair of people in the network).

The MLA network is slightly bigger and slightly more connected:

- nodes: 3,538
- edges: 10,178
- average degree: 2.9
- average weighted degree: 5.2
- connected components: 70
- largest connected component contains
- nodes: 94.2%
- edges: 97.8%

- diameter 12
- average path length 4.4

The ALA network is the largest and most connected:

- nodes: 7,851
- edges: 20,505
- average degree: 2.6
- average weighted degree: 3.9
- connected components: 99
- largest connected component:
- nodes: 96.1%
- edges: 98.9%

- diameter: 14
- average path length: 5.4

So what happens when we put it all together?

Merging the three networks together creates some overlap of nodes (people on Twitter during more than one conference) and edges (people tweeting to the same people at more than one conference) but the three networks remain largely discrete. The force atlas 2 layout I employed in Gephi created more overlap of the AHA and MLA conferences than the ALA conference, but in general disciplinarity is the rule of the day.

While some of this is likely an artifact of most scholars’ inability to physically attend multiple conferences (the AHA and MLA, in particular, occurred at the same time in Colorado and Pennsylvania respectively), scholars have the ability to interact via Twitter with conferences they aren’t attending. The co-occurrance of the AHA and MLA could have – theoretically – *increased* connectivity between the two conferences if similar themes and conversations arose at both then connected via social media. Alas, I don’t have the 2015 metrics (the last time these conferences didn’t co-occur) to do a comparison, but if anyone has them and wants to share I’d love to see them!

In general, the merged “Big Three” network stats clearly derive from their constituent conferences’ stats:

- nodes: 13,489
- edges: 37,308
- average degree: 2.8
- average weighted degree: 4.5
- connected components: 203
- largest connected component:
- nodes: 95%
- edges: 98.3%

- diameter: 16
- average path length: 5.9

One of these numbers, however, immediately jumped out at me as *not like the others*: the number of connected components. If only the largest connected component of each conference network had been able to connected in the Big Three network, there should have been 74+(70-1)+(99-1)=241 connected components. Instead, 38 of the small components in the conference networks appear to have merged with another component (either the largest connected component or another small component).

This is encouraging to me as it implies that there is an interdisciplinary scholarly community that emerges on Twitter, not just in the dense “center” of the network but also in the disconnected “margins.” In is not (yet?) clear whether this interdisciplinary community is generated by digital humanists, librarians, geographical proximity, common interests, or – most likely – some combination of factors, including some I haven’t considered.

Regardless of the cause, *something* is going on. In the interests of exploring it, next time I’m going to restructure my data as a bipartite network to see if anything else interesting emerges.