Business houses seem to target potential customers on the social network site according to sex, age, location, relationship status, job title, workplace or university.
In fact advertisers respond to a Facebook page update in not more than few seconds.
And when it is turned from single to engaged then the previous ad generally gets replaced by something like a building inspection company, which asks: "Buying a property?"
Similarly other products are also advertised, reports the Daily Telegraph.
Shannan Human, 30, of Dee Why shared her experience: "Since I've changed my status to married I keep getting all this baby stuff, and I don't want to have a baby.
"And when I changed to engaged I used to get stacks of wedding gown ads and weight-loss ads.
However, she is not too happy with the smart marketing strategy.
She said: "I find it a bit of a pest, to be honest. I use Facebook primarily as a social networking site to keep in touch with my friends and family.
"I feel like it's an invasion of my privacy if I don't want my stuff sold to a third party - I'm there to socialise with friends, not to make money for other people."
Facebook regional vice-president Paul Borrud has defended the advertising policy.
He said: "The internet has moved from anonymity to authenticity It is about real people; the advertising is going to a real person, and what you were into 10 years ago - movies, music, books has changed.
"So it gives the advertiser the chance to engage with a community based on what they are today."
But groups in Facebook are protesting against the ads.
The group People Against Intrusive Advertising on Facebook states: "Facebook is getting greedy at our expense".
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