This is probably a pet peeve of mine but I hate to see photos of parents with their kids on dating sites and other web-pages.Would you post a picture of you and your kid in the middle of a train station? The Internet is open to all and you have no control over the type of person who views your photos in many cases.
There have been cases of sexual predators combing dating sites looking for single parents. They strike up a relationship with the parent to have access to the child. An example of such a case can be seen here: sexual predators on dating sites.
Dating websites are for adults to meet other adults and so kids should not be involved in any way until you are very sure of the person you are dealing with. This is also a good reason not to bring your kids on a date with you even if your date says they have kids of their own.
The best advice is not to post any photos with your kids online. Do not specify their ages or gender either on your profile or in emails or messages until you are very sure of the person you are talking to.
How do you feel about this issue? Do you think dating websites have an obligation to police their sites to remove sexual predators? Should they police the photos that are posted and remove any that include children in the photo?