The Samsung B7722 comes packing some cool features along with dual-SIM capability. Some of those cool features include dual standby, a 3.2 inch display screen with touch-sensitivity, Wi-fi, Bluetooth 2.1, FM radio, a 5 megapixel camera with LED flash, microSD expansion up to 16GB, 200 MB internal memory and the TouchWiz UI.
The Samsung B7722 is a good one for social networking as well. It also has 3G. This one will cost you $510 and is not bad looking if you need a dual sim phone.