Firstly, if the plants were of the Everbearing variety (as opposed to Day Neutral or June Bearing) they may have very few runners. Secondly, if you experienced a late frost after the growth period had began, runners may not be produced. All varieties should have the blooms pinched off the first year to encourage good root development.
Keep in mind that most Strawberries are, of course, perennials and may need at least one season if not two to develop before expecting much of a harvest...