> Facebook claims to be a social network. Those types of networks normally DO NOT allow you to promote other social networks.
I don't see how that makes it legal.
Herey other examples of potential actions that would also clearly qualify as illegal anti-competive behavior:
Microsoft could decide to block the download pages for Chrome and Firefoz from being shown in IE.
Google could block results related to Bing in their search engine or browser.
I don't see how this behavior by Facebook is any different. If it can be shown that this was done deliberately by Facebook, I have little doubt that it would also qualify as anti-competive behavior.
When you first search on bing for chrome downloads they will put up a big edge promo above the result. After you download they will pop up a box asking if you are sure you want to switch as edge is "Faster and more secure".
The problem for mastadon is it has a TON of content that is against facebook policies. So facebook can simply say - users are reporting this crap as spam - we've blocked it. Done.
Facebook claims to be a social network. Those types of networks normally DO NOT allow you to promote other social networks.
Even review platforms which are a bit more communication in nature block posting other sites reviews.