Facebook's WhatsApp allows users to control who can add them to group chats

LEGAL WARNING: BIST name and logo are protected under the "Protection Trademark Certificate" and cannot be used, quoted or changed without permission. The copyrights of all information disclosed under the name of BIST belong entirely to BIST and cannot be republished. Market data DirectFN Finansal Veri ve Teknoloji Hizmetleri Ltd. Şti. provided by. BIST stock data is delayed by 15 minutes.