FacebookGenericCollection: Build a generic Collection of Facebook data
In facebook.S4: Access to Facebook API V2 via a Set of S4 Classes

Connect to Facebook Graph API, get information from a list of public Facebook items and build a FacebookGenericCollection-class instance.

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FacebookGenericCollection(id, token, parameters = list(),
  fields = character(0), .progress = create_progress_bar(),
  metadata = FALSE)

`id`	A character vector or a comma-delimited string of IDs or an existing Facebook Collection of any of the supported types (see below).
`token`	Either a temporary access token created at https://developers.facebook.com/tools/explorer or the OAuth token created with `fbOAuth`. If token `NULL` and `id` is a collection, use the token of the source collection. Otherwise, no query is performed to the Facebook Graph API and an empty collection is returned.
`parameters`	A list of parameters to be added to the Facebook Graph API query. For more information on the accepted parameters, see: https://developers.facebook.com/docs/graph-api/using-graph-api.
`fields`	A character vector with the fields to get for each `id`. If no value for a given field is found, it will be set to `NULL`.
`.progress`	progress_bar object as defined in the plyr package. By default the `none` progress bar is used, which prints nothing to the console. See create_progress_bar for details.
`metadata`	If set to `TRUE`, the metadata for each ID is pulled with the data and the `type` slot is fed accordingly. Please note that setting this to `TRUE` could considerably slow down the execution time, as more queries are needed.