Not sure it matters seeing as Facebook's Flow is already more popular. Good luck searching for "How do I [X] in flow" without getting more result for Facebook's Flow.
Even if Facebook's Flow never existed, the word "flow" is a challenging term to search for and was a poor name for both Flow9 and Facebook's Flow.
Even if Facebook's Flow never existed, the word "flow" is a challenging term to search for and was a poor name for both Flow9 and Facebook's Flow.