Do Facebook base their advertising more on likes or on any recent activity?

[AK47]

I just accidentally liked something for the first time on facebook and I'm so cross with myself because I've just participated in market research for free. I know google and ebay etc are the same but somehow it's different to have advertising based on something you just generally like (which is more personal) than on just a search that you happened to be doing for something in particular (eg train journeys). I won't even know whether or how the like has influenced the adverts - it's hard selling disguised as soft selling. I feel like I've just whored myself out to capitalism. So I want to know how long it will be influencing the adverts I see. I assume there's no way to get rid of it.

[Max]

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