Birch has helped co-found several startups including Blab, BirthdayAlarm.com, Ringo.com, and social networking site Bebo.

[4] Birch and Xochi later founded the online social networking website Bebo[5] in January 2005, with a major launch in July 2005.

In 2007, Bebo had over 45 million registered users and was the sixth most popular site in the UK, bigger than AOL, Amazon.co.uk and bbc.co.uk.

[10] In 2013 the Birches founded an exclusive but not elite members club called The Battery,[11] in San Francisco, with their vision stated as "to create a culture where inspiration is embraced, diverse communities come together and egos are checked at the door.

"[12] In July 2009, Michael co-founded PROfounders Capital with Brent Hoberman, Peter Dubens, Jonnie Goodwin, Rogan Angelini-Hurll and Sean Seton-Rogers.