Well, a lot of people suggest that you at least have a core area over which you become a "go to" person. Mine is commentary on current events, but I also post poetry, blurbs about my novels, jokes, and then I sometimes "resteem"the work of others as well.
The only way to PM is by sending them .001 SBD and attaching a message to the comments that go with the transaction, and then have them reply by sending back the same .001 SBD with their comment line utilized.