If you start to notice really weird advertisements popping up in strange places on popular websites like YouTube, you might be infected. These ads tend to feature adult content or claim that a virus has been detected on your device and will often appear in places that you don’t normally see ads.
You may discover that your personal email or social networking sites are sending out messages that you didn’t write. If this happens, you should immediately change your password to stop any more messages being sent from your account… More at iMore.
It’s an age-old question, but one to think about now and then.