It’s gotta wear a guy down constantly having to convince everyone you’re not dead. Steve Jobs had to reassert his worldly existence once again today. It’s becoming an almost weekly event. This time someone posted an item on ireport.com, CNN’s website for so-called citizen journalists, saying Jobs had suffered a heart attack. The stock tanked 5 per cent before Apple said the claim was false. The ireport website advertises itself as “unedited. unfiltered.” How about adding: untrue.