Twitter, one of the most widely-used social networking sites, faces attacks of rogue-antivirus products and social engineering.

Scammers are entering en-masse their Twitter statuses using keywords, such as "Twitterbest "and "Zasaden" in effect elevating the URLs to the so-called Twitter Trend Topics – the most frequently-used terms.
These are then connected to rogue links, usually containing a "catchy" phrase, such as one referring to pornographic content.
By clicking a link affiliated with the status keyword, the user is directed to fake websites containing malicious code.
Security company ESET urges users to refrain from clicking these sites as they typically urge the visitor to consent with a utility update, such as a Flash player or contain some other malicious application.
If the user consents to a download, the malicious software becomes installed and the user receives a false notice of an infiltration in his/her computer. Subsequently, an offer to download a "Fast Anti-Virus 2009" appears.
According to Juraj Malcho, the head of ESET VirusLab: "Rogue antivirus solutions and other forms of malicious application present a danger because they can lure significant amount of money from an unskilled user. Moreover, this form of malware tends to employ pesky dialog boxes, which are a drag on productivity."