Give player the chance to make/join a guild. And have a guild house and so on. Becuase its boring just saying that they're friends. Guilds. Guilds! There would the PVP ~ PVE come in. This will help ALOT!

If they have/join a guild. You should make a place in the forum called "Guilds"

Where the application should look abit like this:

Guild name:
Amount of players already:
Emblem:
Tabard lookalike:
What?: <--- PVP or PVE here