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Were they cutlery knives? That is the only thing that you're allowed to boost on Facebook and other places. There may have been something added to your timeline because of "your expressed interest" that was done by Facebook but not the result of a paid boost. For example, I'll see gun stuff from gun groups on Facebook, even though I'm not a member of the groups (it seems that Facebook thinks I have an obsession with firearms...)I get ads for knives in my news feed all the time. I also follow the pages of several local gun stores that list their specials/etc in posts on a regular basis.