Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: Shares in the social networking giant Facebook have finally surpassed their previous high of $45 (£28), reached on their first day of trading in May 2012.

Facebook shares hit highest price since May 2012 debut