Make sure to read the Interview with Star Trek Online Executive Producer Craig Zinkievic (Its in another language but scroll down and youll see a link that says "English Version)

Here is a quote:
Being a captain of a space ship full of NPC's, cruising around the infinite universe sounds - well a bit lonely for an MMORPG. Won't the players, even with fleets, on-ground fight cooperation and mass PvP, feel alone? After all, the universe is just huge.
You will be able to team up with your friends in both space and ground. There will be a variety of starbases, space stations and gathering spots throughout the game where players can communicate and socialize.
Star Trek Online: Exkluzivní rozhovor s Craigem Zinkievichem | MMORPG a Online hry