Weknow.ac as a browser hijacker is a problem specifically for Mac computers and their associated browsers – Google Chrome, Safari and Mozilla Firefox. Those sites that offer some PC-based virus removal software for weknow.ac probably know nothing in malware analysis and simply scrape content from other blogs. Weknow.ac attacks Macs after users download and install some cost-free programs in the form of fake Flash Player update alerts. It’s not something unusual today when Macs are being attacked by adware and potentially unwanted utilities. Thus, having a powerful cleaner specifically for Mac is as important as having anti-virus for PC. Weknow.ac…