update_page: Update or get posts from a Facebook page
In jogrue/RfacebookHelperFunctions: Useful functions for Rfacebook and rtweet

Description Usage Arguments Value Examples

This function updates one Facebook page with Rfacebook's getPage. It looks for a previously stored data.frame (readable by readRDS, e.g., bbcnews.rds). If there is one, it tries to scrape newer (and older) posts than the ones already stored in the data.frame. Otherwise it creats a new data.frame.

update_page(
  page,
  token,
  datafile,
  go_back = TRUE,
  n_posts = 100,
  feed = FALSE,
  reactions = FALSE,
  max_repeats = 100,
  debug = FALSE
)

`page`	A page name or ID.
`token`	Either a temporary access token created at https://developers.facebook.com/tools/explorer or the OAuth token created with fbOAuth.
`datafile`	The full path to a RDS data file.
`go_back`	Go back in time, not only update newer posts, but also get older ones. Default is TRUE.
`n_posts`	The number of posts to scrape from the page, defaults to 100.
`feed`	If TRUE, the function will also return posts on the page that were made by others (not only the admin of the page).
`reactions`	If TRUE, will add variables to the data frame with the total count of reactions: love, haha, wow, sad, angry.
`max_repeats`	The number of repeated calls to scrape data backwards. If go_back is TRUE, there will be repeated calls to go back in time (each call gets the number of posts in n_posts). The backward scraping will stop after max_repeats is reached. Defaults to 100.
`debug`	If TRUE, more information will be printed.

TRUE if it ran through.

## Not run: 
# You have to authenticate with Facebook's API first. For more in this visit
# Rfacebooks documentation.
fb_oauth <- Rfacebook::fbOAuth(app_id="123456789",
                               app_secret="1A2B3C4D",
                               extended_permissions = TRUE)

# The BBC news page's posts are updated and stored in the user's home
# folder in the directory "temp" as "bbc.rds". If the file does not already
# exist a new file is created
update_page("bbcnews", fb_oauth, "~/temp/bbc.rds")

# The data set can be loaded with readRDS
readRDS("~/temp/bbc.rds")

## End(Not run)