The latest valuation is a massive increase for the company, which Facebook Inc offered to buy for $3 billion in late 2013. Snapchat’s previous funding round, completed late last year, valued the company at more than $10 billion. Executives of the company, which allows its more than 100 million users to send messages that disappear after a few seconds, are in advanced talks with fund managers, the person told Bloomberg. The investments being discussed would value Snapchat between $16 billion and $19 billion overall, Bloomberg reported.