integer; the unique id identifying the oldest post that you
would want to retrieve in this function call
return_df
logical; do you want to return the results as a tbl_df
with one row per entity or as a list with one element per entity?
paginate
logical; do you want to paginate through results or just return
the first page?
max_pages
integer; a limit to the number of pages to retrieve from
paginated endpoints. Instagram feeds have the potential to paginate forever,
so by default we stop after pulling 10 pages. If you would like more or less
pages returned, then modify this argument.