That can happen to a stock you bought at $300 and saw though to $650 to $700. Profits can dwindle away if you completely discount the possibility that past performance and an extraordinary present are not necessarily indicative of future results.

When the writing on the wall starts turning into reality, don't let emotion keep you in a position out of spite. That's not a call to sell Apple today. It is, however, a piece of prudence to keep your head on straight and listen attentively when respectable figures such as Craig Barrett can't even stop talking about Steve Jobs.

At the time of publication, the author was long FB.

This article is commentary by an independent contributor, separate from TheStreet's regular news coverage.
Rocco Pendola is a private investor with nearly 20 years experience in various forms of media, ranging from radio to print. His work has appeared in academic journals as well as dozens of online and offline publications. He uses his broad experience to help inform his coverage of the stock market, primarily in the technology, Internet and new media spaces. He has taken a long-term approach to investing, focusing on dividend-paying stocks, since he opened his first account as a teenager. Pendola, 37, is based in Santa Monica, Calif., where he lives with his wife and child.

If you liked this article you might like

Cramer: Dominoes Are in Play Today

Novice Trade: Apple

Stocks In Negative Territory as Chances for December Hike Surge

Bloomberg Claps Back at Trump at Inaugural Business Forum

Why Apple Pay Cash Won't Be a Venmo Killer: PayPal CEO