Hi S.,
Though I do not currently attend any playgroups, I have heard from many ladies that Shandon Baptist Curch has a wonderful SPOTS program twice a month. They are located in the Forest acres/ Fort Jackson area of town. Have you taken your girls to toddler storytime at any of the local libraries? My 2 yr old daughter loves the interaction she gets with other kids her age and I myself have met alot of nice moms too! Yahoo has alot of Columbia area mom groups also. Just go to the Yahoo home site, click on groups and search! I have just joined one (Columbia_SC_Stay_at_Home_Mommys) but they have yet to set up any playdates. Maybe they will very soon! Hope this helps!
A.