[icedchai]

It's difficult to generalize. It definitely depends on your location, and especially population density. Before 1995, it was mostly nerds and early adopters. By 1995, in the north east US, dial up internet had definitely gone mainstream. Local ISPs had ads on the radio. A new one was popping up everyone couple of months. By late 1997, early '98, broadband services (@Home cable modems, DSL) were starting to roll out.

The Netscape IPO, in summer 1995, and also the release of Windows 95, really marks the "mainstream" period. Getting online with Trumpet Winsock and Windows 3.1 was a PITA.