I agree. Actually, more or less, everyone who isn't a transfer student should at least know of each other. I say this because from all the profiles I've seen, those who aren't transfers anyway, all attended Hogwarts. Sooooo..... even if they weren't 'housed' together, they went to the same school and saw each other at the very least. Some might know ones better than others. Like, for instance, those in the same year probably know each other better than those of a different year just like those of the same house might know each other better, etc.
Also, if people want, you can have it such that some of you have already got established (or are in the process of establishing) relationships or have had past relationships that ended back in the day. This can add interesting twists and such. We can also have some people be enemies if we want. Really, we can do what we want. Plus, things will obviously evolve over time as we develop our characters and write up their interactions with each other.
AH DRAMA! LOLOL....... so.... who wants to start this off???? Maybe this'll spur on the others who need to get their butts in gear and post their already ok'd profiles, LOL!