Brett is to join Bebo after a year working on 'KateModern', having previously worked on over 20 TV productions for the BBC, Sky and ITV amongst others.
She will be based in London and will be responsible for vetting potential projects, building a collaborative relationship with Bebo's production partners and advertisers and ensuring a great experience for its users.
Kate Burns, managing director of Bebo Europe, said: "At Bebo we are committed to creating one of the most exciting and unique social media experiences on the web, and the success of 'KateModern', 'Sofia's Diary' and 'The Gap Year' shows that Beboers are enthusiastic about truly engaging with media.
"We're proud that Bebo is seen as the place for outstanding original content online and Kelly will bring with her a depth of experience and knowledge in this field to further strengthen our already fantastic team."
Bebo has pioneered the commissioning of high-quality online dramas like 'KateModern' and 'Sofia's Diary', which recently became the first online drama in the UK to transfer to television when it was picked up by Five.
Burns said: "Having worked alongside Bebo for the past 12 months, joining the team feels like a natural and exciting progression for me. Bebo is clearly dedicated to developing this emergent medium with shows such as 'KateModern', 'Sofia's Diary' and 'The Secret World of Sam King'.
"Working closely with the production companies and sponsor brands, we will continue to ensure that Bebo's original productions are engaging and enticing," added Brett.
Amongst Brett's first original commissions will be 'The Secret World of Sam King', which is a first between a social network and a music company. The drama revolves around a junior 'facilities' employee at Universal Music who secretly founds his own start-up label in the post room.
Producers will draw on real-life experiences along with cameo appearances from Universal artists to bring additional authenticity to the setting and story.