Facebook's hidden battle against ad-blockers

The social network injects dozens of lines of code in every page to make it harder for ad blockers to detect and hide sponsored posts. Facebook provides some controls for users to influence the ads they see. "Although you can't opt out of seeing ads entirely, you can influence the types of ads you see by giving us feedback or hiding ads and advertisers that you don't want to see," it says in its help centre. In one case, they worked at blocking ad containers labelled "Feed subtitle" and "Feed-subtitle". Two days later, Facebook had changed its code again.

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