Here's a comparison of Corbyn's 2 facebook pages compared to the other parties (and official labour page).
Both of his pages had engagement of over 140 thousand people, which probably means over a million people viewing each page, though there will be a fair amount of cross over, it's probably at least 1.5 million people reached between them.
eta - actually those figures are only for direct shares and likes on the original posts, and don't include shares and likes on the shared posts, which could easily double those figures, and the post reach could be significantly higher than that as facebooks algorythms really boost the visibility of posts that have a lot of likes, shares etc.
I've been monitoring this for months, and these figures are fairly standard weekly figures.
It may well be the same people being hit on a regular basis, but it's a great way of shoring up his core support, and ensuring there's a large support base that is getting regular direct messaging to bypass the mainstream media, and then pass this on to their social circle etc.
Best political social media campaign I've seen by far, though the tories made really good tactical use of it at the election this was largely with paid for advertising, I don't think corbyn has done any paid for advertising.
btw I have another angry voice in there to show the comparative reach of an independent left wing political blogger, who has a regular social media reach that's about the same as corbyns is now, and is way bigger than any of the other political parties. And he's just one bloke from Leeds.
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