Here's Slate on Facebook's nearest rival, the (other) social network, that almost became the place to socialize online:
As The Social Network dramatizes, Mark Zuckerberg founded Facebook after allegedly backing out of a commitment to work on another networking site, Harvard Connection. Lawsuits ensued, and Zuckerberg ended up shelling out tens of millions of dollars in a settlement with his one-time partners. What the film doesn't mention are all the other college social networks that Facebook shoved aside as it expanded across the country. Of those sites, perhaps the greatest threat to Facebook's dominance was Campus Network, then called CU Community after Columbia University, where it was founded.