No matter what you choose, build stuff and be around smart people.
... you want to be proud of how much you can get done with a small numbers of employees.
The biggest PR hack you can do, is not hire a PR firm.
You need to figure out what the 2 or 3 most important things are, and then just do those.
... but actually it sucks to have a lot of employees, and you should be proud of how few employees you have.
The tenth social network, and limited only to college students with no money, also terrible. Myspace had won.