Sharon, you can look in the "history" section to see who has posted. For example, clicking the link on "Flying United", I find the 3 most recent posters are:

# (cur) (last) 02:32, 12 Dec 2005 GoingAway
# (cur) (last) 21:22, 11 Dec 2005 Bdjohns1
# (cur) (last) 23:22, 8 Dec 2005 Izzik

When I click "history" for Mileage Plus Program Basics, I find:

# (cur) (last) 18:05, 12 Dec 2005 216.229.35.69 (→Mileage Statement)
# (cur) (last) 18:05, 12 Dec 2005 216.229.35.69 (→Mileage Statement)
# (cur) (last) 17:52, 12 Dec 2005 207.200.116.70 (→Mileage Statement)

I have no idea what the IP addresses mean, as there are also a number of handles shown who have posted.