From the original article: "Title tags are the nuclear warheads of content marketing: While they contain only a very small mass — roughly 65 characters — they pack an unbelievable punch.
Because of title tags’ enormous impact on SEO, social sharing and conversion, content marketers should know how they work, and how to put them to work
Theoretically, title tags can be of any length. However, length and composition are greatly influenced by the fact that Google displays only the first 65 characters or so in search engine results.
a) Remember that each title tag on a website or blog should be unique, and completely relevant to the content of the page.
b) Besides appearing in search engine results, title tags are displayed in many other high-visibility locations, including in browser tabs and social media shares.
c) Title tags are the most important onsite ingredients for SEO because they explain to Google and other search engines what each page is about.
d) Explain well and your pages will enjoy higher rankings; explain poorly and Google won’t know how to match up your page to search queries."
by Brad Shorr - http://bit.ly/zjRgss - @bradshorr