There are plenty:

* Monetate * Infuse Media * Venmo * Vuzit * MyYearbook * Relay Network * PackLate * ClickEquations * Portico

And these are just the ones I could think of before I got bored with this question ;-)

Also, First Round doesn't really invest in a lot of Philly startups at this point. They do know most of the people in the area, though.