Smartphones with high data limits make it easy to stay connected on Facebook, Ms Chalkey says.
Her coffee group all have Facebook on their mobiles, making it easy to compare their recent 9-month Plunket visits and seek advice on such matters as formulas and teething sprays.
Most of her family live in South Africa, so Facebook is an easy way to show them Emma's progress. "Emma has just started crawling, so my sister asked me to post a video."
Chantal Pennington also finds it useful for her friends and family in Australia to see daughter Mikayla grow, as frequent travel is expensive.
Mums on Top provides a platform for mothers to express thoughts and encourages discussion about issues from depression to immunisation to planning birthday parties.
One mother returning to work narrowed down her choice of daycare to three, without having visited any, purely from the recommendations of fellow mothers on Facebook.
Another, concerned with her 13- year-old son wanting his own Facebook profile, posted online her concerns and asked for tips on the appropriate age and privacy settings.
Alex Larsen, 22, finds Facebook useful to connect and communicate with other first-time mothers. She researches questions on Google and checks with other Facebooking mothers.