Visualizing Twitter history with streamgraphs in R

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I was exploring ways to visualize my Twitter history, and ended up creating this interactive streamgraph of my 20 most used hashtags in Twitter: The graph shows how my Twitter activity has varied a lot. The top three hashtags are #datascience, #rstats and #opendata (no surprises there). There are also event-related hashtags that show up only once, such as #tomorrow2015 and #iccss2015, and annually repeating ones, such as #apps4finland.

How this was made?

Twitter has quite a strict policy for obtaining data, but they do allow one to download the full personal Twitter history, i.e. all tweets as a convenient csv file (instructions here), so that’s what I did. The visualization was created with the streamgraph R package that uses the great htmlwidgets framework for easy creation of javascript visualizations from R. The plots are designed for daily data, but this ended up being too messy, so I aggregated the data on monthly level instead. Embedding the streamgraph htmlwidget into this Jekyll blog required a bit of hazzle. As pointed out in the comments here, the widget must be first created as a standalone html file and then embedded as an iframe. Hopefully there will be a more straightforward way to include htmlwidgets to Jekyll blogs in the future! Some problems:
  • The size of the widget has to be fixed when creating, so it will not scale automatically. This could possibly be fixed in the streamgraph package following this.
  • Font size of the graph is very small, but I could not find a way to change it, even in the javascript source.
The script for producing the streamgraph from the Twitter data is here. It is also printed below, with the help of read_chunk(). See more details from the rmarkdown source for this post.
# Script for producing a streamgraph of tweet hashtags

# Load packages

# Read my tweets
tweets_df <- read_csv("files/R/tweets.csv") %>%
  select(timestamp, text) %>%
  mutate(text = tolower(text))

# Pick hashtags with regexp
hashtags_list <- regmatches(tweets_df$text, gregexpr("#[[:alnum:]]+", tweets_df$text))

# Create a new data_frame with (timestamp, hashtag) -pairs
hashtags_df <- data_frame()
for (i in which(sapply(hashtags_list, length) > 0)) {
  hashtags_df <- bind_rows(hashtags_df, data_frame(timestamp = tweets_df$timestamp[i],
                                                   hashtag = hashtags_list[[i]]))

# Process data for plotting
hashtags_df <- hashtags_df %>%
  # Pick top 20 hashtags
  filter(hashtag %in% names(sort(table(hashtag), decreasing=TRUE))[1:20]) %>%
  # Group by year-month (daily is too messy)
  # Need to add '-01' to make it a valid date for streamgraph
  mutate(yearmonth = paste0(format(as.Date(timestamp), format="%Y-%m"), "-01")) %>%
  group_by(yearmonth, hashtag) %>%
  summarise(value = n())

# Create streamgraph
sg <- streamgraph(data = hashtags_df, key = "hashtag", value = "value", date = "yearmonth",
                 offset = "silhouette", interpolate = "cardinal",
                 width = "700", height = "400") %>%
  sg_legend(TRUE, "hashtag: ") %>%
  sg_axis_x(tick_interval = 1, tick_units = "year", tick_format = "%Y")

# Save it for viewing in the blog post
# For some reason I can not save it to files/R/ direclty so need to use file.rename()
saveWidget(sg, file="twitter_streamgraph.html", selfcontained = TRUE)
file.rename("twitter_streamgraph.html", "files/R/twitter_streamgraph.html")

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