There is a building on Dublin’s Grafton Street where people work both as matchmakers and online child protectors. Rena Maycock is the woman behind both. A former radio and media executive turned serial entrepreneur, Maycock established Intro with her husband Fergal Harrington back in 2011, and the business trades successfully. Now, however, her main priority is Cilter, child-protection software that makes the internet use safe for children The company is currently fundraising, retaining PwC to secure investors for its mobile content filter. Discussions are ongoing. The genesis for the new business came four years ago, when Maycock was pregnant with…