Secret, a fast-growing mobile app that allows users to share notes with others anonymously, has secured a further $25-million in funding and aims to expand as a social network.The app – until recently an anonymous messaging board running on the Android and iOS platforms – with now allow users to log in with their Facebook credentials. Users can then share Secret posts with Facebook friends, without compromising their anonymity.

Secret is a start-up co-founded by ex-Google employees Chrys Bader-Wechseler and David Byttow, and is a platform for doing good, speaking candidly and reporting bad behaviour. “We built Secret for people to be themselves and share anything they’re thinking and feeling with their friends without judgment.”

According to the company’s blog post, funding has come from Index Ventures, Garry Tan and Alexis Ohanian, Redpoint Ventures, SV Angel, Fuel Capital, Ceyuan Ventures and “several others that shall remain a secret”.

The new funding will boost the company’s market value to $100-million.