Let's say you met an over-educated, underemployed, thirty-something man who seemed incapable of holding down a relationship, and who was known to date up to half-a-dozen women at a time after meeting them online. If you had to come up with a single theory to explain his desultory love life, what would it be? 

Dan Slater thinks you should blame the Internet. His article in this month's Atlantic, "A Million First Dates," argues that online matchmaking services like OKCupid and eHarmony are so powerful that they are bound to infect us all with a collective case of romantic ADHD -- or, as he puts it, that "the rise of online dating will mean an overall decrease in commitment." The impulse to search for "an ever-more-compatible mate with the click of a mouse" will prove so intoxicating over the long term, he writes, that it could undermine the very notions of marriage and monogamy.