View http://www.paciellogroup.com/blog/2013/01/using-the-html-title-attribute-updated/
Some time ago, the title attribute took off like crazy. I’m confident it was as a result of some high profile SEO publications pushing it as another way to stuff your keywords into every single one of your pages. As with many of the gray SEO practices out there, there are many negative side effects to abusing the title attribute.
As per the article, the introduction of touch devices has further abstracted the usefulness of title. This article outlines modern use cases for title in addition to calling out the times where we should stop using it.