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I don't see any ads on these sites using uBlock Origin. Maybe it is your problem?

Time to update filter lists.

Update your lists.

Perhaps the auto update of the extension depends on the update settings of your browser.

Here is the developer of uBlock Origin, telling me how to block Twitter specific requests: https://news.ycombinator.com/item?id=11141600

uBlock Origin blocks nothing but what YOU tell it to. The problem isn't uBlock.