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diff --git a/presentations/lightning_talk.qmd b/presentations/lightning_talk.qmd
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+---
+title: "Do Servers Matter on Mastodon?"
+subtitle: "Data-driven Design for Decentralized Social Media"
+author: "Carl Colglazier"
+institute: 
+  - "Community Data Science Collective"
+  - "Northwestern University"
+date: "2024-03-08"
+title-slide-attributes:
+  data-background: "#4c3854"
+format: 
+  revealjs:
+    width: 1600
+    height: 900
+    date-format: long
+    margin: 0.2
+    center-title-slide: false
+    #disable-layout: true
+    theme: [default, presentation.scss]
+    slide-number: false
+    keep-md: true
+    pdf-max-pages-per-slide: 1
+    template-partials:
+      - title-slide.html
+#  beamer:
+#    aspectratio: 169
+#    theme: metropolis
+#    colortheme: seahorse
+knitr:
+  opts_chunk:
+    dev: "ragg_png"
+    retina: 1
+    dpi: 300
+execute:
+  freeze: auto
+  cache: true
+  echo: false
+#  fig-width: 5
+#  fig-height: 6
+prefer-html: true
+---
+
+## Empirical Context
+
+::: {.columns}
+
+:::: {.column}
+
+- **The Fediverse**: A set of decentralized online social networks which interoperate using shared protocols like ActivityPub.
+
+- **Mastodon**: An open-source, decentralized social network and microblogging community.
+
+::::
+
+:::: {.column}
+
+![A screenshot of Mastodon 2.9 (2019), from the Mastodon Blog.](images/Mastodon_Single-column-layout.png)
+
+::::
+
+:::
+
+# The Fediverse is a network of _thousands_ of interconnected servers {background-color="black" data-background-image="images/mastodon_map.png" background-repeat="repeat" background-size="200px" background-opacity="0.5" .center auto-animate=true .fade-out}
+
+## Mastodon grew significantly in 2022 and 2023
+
+```{r}
+#| label: fig-account-timeline
+#| fig-width: 5
+#| fig-height: 2.5
+library(here)
+source(here("code/helpers.R"))
+account_timeline_plot()
+```
+
+## Which server should I join?
+
+### Conflicting advice
+
+::: {.columns}
+::: {.column}
+
+Just join any server! 
+
+:::
+::: {.column}
+
+Join the _right_ server!
+
+:::
+:::
+
+::: {.fragment}
+### Which is right? {.center-xy}
+:::
+
+---
+
+![](images/joinmastodon-screenshot.png){.center}
+
+# Does server choice matter? {.center}
+
+## Survival model for new accounts
+
+Are they more likely to stay active after 91 days.
+
+::: {.columns}
+
+::: {.column}
+
+```{r, cache.extra = tools::md5sum("code/survival.R")}
+#| cache: true
+#| label: fig-survival
+#| fig-env: figure
+#| fig-cap: "Survival probabilities for accounts created during May 2023."
+#| fig-width: 3.375
+#| fig-height: 2.25
+#| fig-pos: h!
+
+library(here)
+source(here("code/survival.R"))
+plot_km 
+```
+
+:::
+
+::: {.column .small}
+
+```{r}
+#| label: tbl-coxme
+library(ehahelper)
+library(broom)
+
+cxme_table <- tidy(cxme) %>%
+  mutate(conf.low = exp(conf.low), conf.high=exp(conf.high)) %>%
+  mutate(term = case_when(
+    term == "factor(group)1" ~ "Join Mastodon",
+    term == "factor(group)2" ~ "General Servers",
+    term == "small_serverTRUE" ~ "Small Server",
+    TRUE ~ term
+  )) %>%
+  mutate(exp.coef = paste("(", round(conf.low, 2), ", ", round(conf.high, 2), ")", sep="")) %>%
+  select(term, estimate, exp.coef , p.value)
+
+cxme_table %>% knitr::kable(digits = 3)
+```
+
+:::
+
+:::
+
+## Accounts that move
+
+Do they move to larger servers or to smaller servers?
+
+::: {.small}
+
+```{r}
+#| label: tbl-ergm-table
+#| echo: false
+#| warning: false
+#| message: false
+#| error: false
+
+library(here)
+library(modelsummary)
+library(kableExtra)
+library(purrr)
+library(stringr)
+load(file = here("data/scratch/ergm-model-early.rda"))
+load(file = here("data/scratch/ergm-model-late.rda"))
+
+if (knitr::is_latex_output()) {
+  format <- "latex_tabular"
+} else {
+  format <- "html"
+}
+
+x <- modelsummary(
+  list("Coef." = model.early, "Std.Error" = model.early, "Coef." = model.late, "Std.Error" = model.late),
+  estimate = c("{estimate}", "{stars}{std.error}", "{estimate}", "{stars}{std.error}"),
+  statistic = NULL,
+  gof_omit = ".*",
+  coef_rename = c(
+    "sum" = "Sum",
+    "nonzero" = "Nonzero",
+    "diff.sum0.h-t.accounts" = "Smaller server",
+    "nodeocov.sum.accounts" = "Server size\n(outgoing)",
+    "nodeifactor.sum.registrations.TRUE" = "Open registrations\n(incoming)",
+    "nodematch.sum.language" = "Languages match"
+  ),
+  align="lrrrr",
+  stars = c('*' = .05, '**' = 0.01, '***' = .001),
+  output = format
+  ) %>% add_header_above(c(" " = 1, "Model A" = 2, "Model B" = 2))
+
+x
+```
+
+:::
+
+# Our analysis suggests {.center}
+
+- Accounts on large, general servers fare worse
+- Moved accounts go to smaller servers
+
+Can we build a system that helps people find servers?
+
+# Recommendation System Concept
+
+- Report top **hashtags** used by the most accounts on each server
+- Build an $M \times N$ server-tag matrix
+- Normalize with Okai BM25 TF-IDF and L2 normalization
+
+
+::: {.fragment}
+Using this matrix, we can
+
+- Calculate similarity between servers using tags
+- Calculate similarity between tags using servers
+- Reccommend servers based on affinity toward certain tags
+:::
+
+## Example: Server Similarity
+
+::: {#tbl-sim-servers}
+
+```{r}
+#| label: table-sim-servers
+library(tidyverse)
+library(arrow)
+library(here)
+
+sim_servers <- here("data/scratch/server_similarity.feather") %>% arrow::read_ipc_file() 
+server_of_interest <- "hci.social"
+server_table <- sim_servers %>%
+    arrange(desc(Similarity)) %>%
+    filter(Source == server_of_interest | Target == server_of_interest) %>%
+    head(7) %>%
+    pivot_longer(cols=c(Source, Target)) %>%
+    filter(value != server_of_interest) %>%
+    select(value, Similarity) %>%
+    rename("Server" = "value")
+
+if (knitr::is_latex_output()) {
+  server_table %>% knitr::kable(format="latex", booktabs=TRUE, digits=3)
+} else {
+  server_table %>% knitr::kable(digits = 3)
+}
+```
+
+Top five servers most similar to hci.social
+
+:::
+
+# Future Work
+
+- Evaluation of the recommendation system
+- More specific analysis of account attributes
+- Simulations for robustness
diff --git a/presentations/presentation.scss b/presentations/presentation.scss
new file mode 100644
index 0000000..052701d
--- /dev/null
+++ b/presentations/presentation.scss
@@ -0,0 +1,140 @@
+/*-- scss:defaults --*/
+
+@import url(https://fonts.googleapis.com/css?family=Montserrat:300,300i&display=swap);
+@import url(https://fonts.googleapis.com/css?family=Josefin+Sans&display=swap);
+@import url(https://fonts.googleapis.com/css?family=Fira+Mono&display=swap);
+
+// fonts
+$font-family-sans-serif: Montserrat, sans-serif !default;
+$font-family-monospace: "Fira Mono", monospace  !default;
+
+// colors
+$body-bg: #fff !default;
+$body-color: #272822 !default;
+$link-color: #055099 !default;
+
+// headings
+$presentation-heading-font: "Josefin Sans", sans-serif !default;
+$presentation-heading-color: #3d2d43 !default;
+
+$h1-font-size: 1.6em !default;
+$h2-font-size: 1.3em !default;
+$h3-font-size: 1.15em !default;
+$h4-font-size: 1em !default;
+
+// code blocks
+$code-block-border-color: #a592ac !default;
+$code-color: $presentation-heading-color;
+
+//
+// Color system
+//
+
+// stylelint-disable
+$white:    #fff !default;
+$gray-100: #f1edf3 !default;
+$gray-200: #e6dee9 !default;
+$gray-300: #d4c6d9 !default;
+$gray-400: #b69ebe !default;
+$gray-500: #9f80aa !default;
+$gray-600: #8b6699 !default;
+$gray-700: #6e5078 !default;
+$gray-800: #63486c !default;
+$gray-900: #4c3854 !default;
+$black:    #000 !default;
+
+/*-- scss:rules --*/
+
+#title-slide {
+    text-align: left;
+    display: flex!important;
+    flex-direction: column;
+    height: 100%;
+    justify-content: space-around;
+}
+
+.title{
+    color: $white;
+    font-size: 2.5em;
+    font-family: $presentation-heading-font;
+}
+
+.subtitle{
+    color: $gray-100;
+    font-size: $h2-font-size;
+    font-family: $presentation-heading-font;
+}
+
+
+.author {
+    color: $white;
+    font-size: $h3-font-size;
+    font-family: $presentation-heading-font;
+}
+
+.date {
+    color: $white;
+}
+
+.message{
+    color: $presentation-heading-color;
+    font-size: $h2-font-size;
+    font-family: $presentation-heading-font;
+    text-align: center;
+}
+
+.space-left {
+    margin-left: 5%;
+}
+
+.center-xy {
+    margin: 0;
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    -ms-transform: translateY(-50%), translateX(-50%);
+    transform: translateY(-50%), translateX(-50%);
+}
+
+.small {
+    font-size: 0.8em
+}
+
+.tiny {
+    font-size: 0.4em
+}
+
+.Large {
+    font-size: 1.6em
+}
+
+section.has-dark-background a {
+    color: $white;
+    border-style: dashed;
+    border-bottom-width: 1px;
+}
+
+section.has-dark-background a:hover {
+    color: $white;
+    border-bottom: solid
+}
+
+.reveal h2 {
+    padding-top: 20rem;
+    padding-bottom: 2rem;
+    padding-left: 20rem;
+    padding-right: 20rem;
+    background-color: $gray-800;
+    color: $white;
+    position: relative;
+    //top: -38rem;
+    margin-top: -22rem;
+    margin-bottom: 2rem;
+    left: -20rem;
+    width: 100%;
+}
+
+/*
+.slide {
+    padding: 2rem;
+}*/
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