\begin{rmdnote}
In the call to \texttt{unnest\_tokens()}, we unnest using the
specialized \texttt{"tweets"} tokenizer that is built in to the
tokenizers package {[}@R-tokenizers{]}. This tool is very useful for
dealing with Twitter text or other text from online forums; it retains
hashtags and mentions of usernames with the \texttt{@} symbol.
\end{rmdnote}