This game is fragmented socially. The way the planets are setup as well as instancing you will rarely find more than a handful of other players while leveling.
I went to the Fleet last night and stopped by the first hub of drop ships. Not a single player other than myself around the quest hubs.
I personally think Bioware got the social aspect of this game wrong. They have made it harder and I have found that this has even changed my play style to run solo since most of the time that is the only option I have.