00327nas a2200109   4500000000100000000000100001008004100002100002100043700003400064700001700098245010200115       2020                            d1 aRuslan Hryshchuk1 aKaterina Molodetska-Hrynhchuk1 aYuriy Syerov00aMethod of Improving the Information Security of Virtual Communities in Social Networking Services