1.   Brian Robertson and Sam Choi are launching their company, Visible Markets, in downtown Boston, with big-name venture backers.

2.   Parizeau and other venture backers say all growth companies have problems, and the issue is how they respond.

3.   The venture backers are optimistic but not patient.

4.   Young entrepreneurs and their venture backers holed up in cramped offices, hatching plans to go public.