For those new to these forums, the player base is actually pretty polarized on this particular issue. The game IS being advertised as an MMO, and as such should have certain multiplayer capabilities built in...some are coming, some are implemented...very poorly, others are non existent. Many question what x feature would add, however, that is not the question that any of us should be asking. The proper question is how the game could be made better because of these additions. To that, I can only answer, by building a sense of in game community, players become more invested in the game and will want to be in game rather than using disparate forums organizing player run activities.
I see where the MMO is in the game, most do not, and many feel that affecting systems and stations is somehow breaking the game and an exploitation. This would become more compelling if there was better multiplayer features, such as wings. We know these are coming and many are patiently awaiting their arrival, however, many players coming to the game expected...because of the marketing...that these features would be more complete. Even many of us early beta testers and backers were surprised that these were so limited in scope for the release.
To conclude, the personal investment due to social tools in the game would definitely increase if they were available, leading to more players in game regularly, rather than out of game dealing with multiple forums and tools, and more player driven content being played and fought over.