The headline is "Facebook cited in 20% of divorces." The story inside, though, is that people reconnect through Facebook with old flames. I think the underlying story is that when we have intimate relations with others it leaves a connection.
In my previous posts on Premarital Sex in America I noted that the authors found that what was bad about a series of intimate relations that do not lead to marriage is not the sex, but the breaking of the ties, over and over.
I take from this that love, and even lesser intimacy, is not without cost, and should not be entered into lightly. Or, in the case of Facebook romances, re-entered into.