There are over 36,000 films with homepages.

Over 1820 are Facebook links.

Over 780 are Vimeo links.

Over 680 are YouTube links.

Over 470 are Wikipedia pages.

Over 440 are BBC iPlayer links.

Over 420 are IMDB pages. Amusingly, 18 of those do not have IMDB_IDs.

Over 350 are British Film Institute links.

84 of which are Amazon URLs.

Around 20 of them are Google search URLs either linking the Google Images page, or where someone has right click copied the link and thus got the Google tracking URL instead.

Anyway, you get the idea.

It is like the wild west with some of them. e.g. it is impossible to know what has been linked without visiting the page for Facebook. Some are proper, some are to pages, some of to events, some are to groups, some are just the Facebook page for the production company.

The IMDB ones are just amusing.

Things like BFI, Wikipedia, BBC iPlayer etc. suggests a need for external sites fields like we have with People on the site.

Not sure YouTube/Vimeo should be on there at all. Again, you have to check each one to see if it is a publicly available short, or a trail, or a music video or a dodgy copy of the entire film etc.

There may be a few issues with people using Amazon referral IDs to generate revenue etc.

The above constitutes 13% of all homepage URLs.