Should I believe husband's claims regarding content on his facebook profile page?

This question is for those out there who are pretty computer/facebook savvy. I am not as interested in responses from folks who just want to express an opinion about "cheating men" or "jealous wives" or hypotheses about why men/women cheat. My question is this: given your knowledge about how facebook works and the process of creating a face page, is it plausible that someone other than my husband could have changed his profile and checked the "interested in meeting women" box? (I know I sound terribly naive here but I need to figure this out so if you have any useful information I would greatly appreciate it.) Could the fault be with facebook itself? Could facebook have somehow malfunctioned on my husband's profile? These are my husbands claims. He also suggested that perhaps he forgot to deselect the "interested in meeting women" box when creating his profile. He swears he has no idea how the phrase got there. To my knowledge, he has never cheated on me in 3 years of marriage and I have trusted him completely until now. So I just need some basic information. I just don't know enough about facebook to know if what he is telling me is believable. FYI: I don't use facebook but joined recently at the urging of friends from work. At my first log in to facebook, my husband's picture popped up as "someone you might know", (ya think?) I clicked on his picture, his profile popped up and that's how I found out. Interestingly, he did have increased security regarding whether a person could become a friend and have full access to the rest of his page. I found this to be in stark contrast to just having the "interested in meeting women" out there for friends, neighbors, coworkers, the whole world, to see. His job carries a lot of responsibility and he is in a position of leadership so putting this stuff out there where his peers and those who work under him could see this stuff shows a level of indiscretion that is uncharacteristic of him. However, he also is new to using facebook but more experienced than myself. (He's been on almost a year) So, given your computer knowledge, could he be telling me the truth or is it more likely that he has lied to me about this? Have any marriages been put on the rocks because facebook itself made an error somehow or is that unlikely? In other words, it is much more likely that the marriage is in trouble due to content the spouse chose to post on facebook for all to see (including the wife)? And likewise, what are the odds that a marriage is sabotaged by unsavory info a computer hacker puts on the spouses profile? (and why would a hacker want to do that? Wouldn't a hacker be more interested in stealing valuable personal info rather than just editting some other guy's profile? Thank you for reading this (long) question and all the other details. . . and thanks for any possible answers/feedback. Nadia N.