When I am not working on leveling, I will normally spend time as a higher level on the start worlds, answering questions, buffing, and generally participating in general chat. Sine we hang out in the heroic areas, if someone asks for help, we can invite them to a group to help them.
BUT, I wait until someone asks for help, either in General chat, or by PM'ing me, rather than randomly inviting players. I know how annoyed I get when someone just randomly tries to group with me as a lower-level player (or any level, actually) when I made no statement saying that I wanted to group.
Slipster