Facebook has what marketing and business types call "network externalities," and what normal people call "My least tech-savvy relative uses it." In other words, even if it's technically inferior to other blogging or social networking tools in many ways, you end up using it because everyone else does. A social network without anyone in it is useless, or, if you prefer, "Friendster." This creates a great niche for a startup to occupy: Writing tools that make Facebook easier and more comfortable to use. Wowd (free) promises to be one such tool.

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Source: Computerworld Linux and Unix News