OK, so I got pissed off at some rouge Mac app that's plaguing OS X users recently, named MacSweeper, which claims to scan and clean OS Xs for problems, but actually does nothing but trouble for the unsuspecting user, scaring him/her to buy the product. In fact, the online scan (link provided only for Windows users; Mac users, avoid clicking it to prevent any problems) is a fake - I tried visiting the supposed scan page, but surprisingly, it showed a scan progress bar and some text, even though I'm using Windows. A legitimate antivirus/security program's online scan service checks the user's operating system and browser, and prompts him/her to download or install an ActiveX control or a plugin - the "scanner", when decompiled using a Flash decompiler tool, is only just a Flash animation, displaying a mock progress bar with some text that are supposedly paths your files, but are actually strings of text masquerading as filenames that are being "scanned".
In short, it's a trap, and a scam. It will ask you your credit card info, which they might steal and use illegally. Contrary to the statement made by the developers of the app, its use of deception and scare tactics are an obvious evidences of bad business practices by the company responsible for this incident. What do you think?