Just a few, somewhat random links. There are an astonishing number of Dark Shadows sites and social media online!
WHERE TO WATCH DARK SHADOWS
Watch the complete Dark Shadows TV series on Amazon Prime Video (episodes and seasons also available for purchase):
Dark Shadows: The Beginning (pre-Barnabas - it's good!)
The MPI Dark Shadows Streaming Service offers the entire series plus bonus content
A rotating set of DS seasons are available for viewing on Hulu
Dark Shadows is available on iTunes
YouTube has everything except the first season (The Beginning) for sale by the episode or season, but it is very expensive
WHERE TO BUY DARK SHADOWS
Watch for occasional sales on MPI, and lightening sales on Amazon.
Beware of counterfeits on eBay!
Pricing for streaming and purchase may seem high. Keep in mind there are 1,225 episodes (about 20 minutes each).
The Collinsport Historical Society - the mother of all DS sites
Dark Shadows Every Day
Shadows on the Wall: An online Dark Shadows Fanzine
Dark Shadows Wiki
Dark Shadows Newspage
Nancy Kersey's blog
Remembering Jonathan Frid: Mike Pearson, Hamilton News
Dark Shadows Online
Dark Shadows on Wikipedia
Dark Shadows on IMDb
Mr Jonathan Frid (YouTube)
Hamilton Community Foundation