It could be possible because different people have had their profiles hacked and used by other people. Pics are easily stolen from either social sites. The people that do it evidently hate themselves enough to use someone else's attributes instead of their own, or to scam.

My answer is like Rebecca G. Said unless he got hacked or identic theft. Only access profile your husband or you if have password. No other ways any one can access unless got hacked and identic theft

Its questionable unless someone other than you has access to his profile and pictures. What kind of pictures were on his profile? Are the explicit pics? Find out what kind and who would possibly have any of him that would place them w/o permission. Its questionable because wouldn't you need a password to even access the profile? But it's not impossible for things such as this to happen.