#3 Flickr

Flickr is an image hosting and video hosting website, and web services suite that was created by Ludicorp in 2004 and acquired by Yahoo! in 2005. Yahoo has been blamed for buying the site and then letting it slip into irrelevance. However the forte of Flickr like file storage, photo album creation, connecting with friends -- were taken on by more general purpose sites. Eventually, Flickr lost the quick-phone-photo market to Instagram.

#4 IBM PC

IBM PC is the progenitor of the IBM PC compatible hardware platform. Alongside "microcomputer" and "home computer", the term "personal computer" was already in use before 1981. It was used as early as 1972 to characterize Xerox PARC's Alto. However, because of the success of the IBM Personal Computer, the term PC came to mean more specifically a microcomputer compatible with IBM's PC products.

By 1983, they had grabbed a quarter of the market leaving behind Apple. To further increase their market share, IBM built PCs almost entirely out of off-the-shelf parts; its only proprietary aspect, its BIOS, was easily reverse-engineered by rivals who soon began peddling PC clones.

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