You know what phishing is, right? Tricking Net users into clicking on bad links and sharing sensitive info like passwords and credit card numbers by pretending to be someone the users trust (a friend, their bank, etc.). Well, Microsoft says the number of phishing attacks in social network sites increased 1,200% last year, eWeekEurope.co.uk reports. Phishers "get a higher return on investment targeting social networks because a handful of sites represent the majority of the users," it adds. Most of the phishing involves financial targets like banks, Microsoft says, "which see between 78% and 91% of all phishing attacks each month."