Online social networking services accessible by means of a website and downloadable mobile applications for the sharing, contributing to, and searching for personal and professional information, addresses, telephone numbers, email addresses, notes, and other correspondence information, and to engage in communication and collaboration, seek introductions to, and request information between and among other users and both in and out of network individuals and businesses to initiate communications, expand social networks, contribute to review or notes, to form groups, and to engage in social networking