I was thinking of whether backstory, ideas for NPC friends, family and rivals, and similar character-building things would be best served as posts on here, or as Private Messages.  Ideally such things could be used as side plots for character development.<br/><br/>The advantages to PMs are that they're confidential and between player and Game Master, allowing for nifty surprises for the rest of the party!<br/><br/>On the other hand, posting here allows for collaborative story-building.<br/><br/>While I do have a main plot in mind, having side adventures for characters are pretty much a staple trope for high school campaigns.