facebook and twitter pics and friends of friends

is kindy of a concern now days when persons misuse the concept of pictures and blogs or even old frinends tags in their tweets and facebook page. i decided to close my page in several network sites because i realize that others misuse the sites to create issues and even lies of dating and friendship i actually encounter this issue my self several years ago when i use to interact in sites like this. i mention this because i came across work friends and even highschool friends from years ago, and not to mention even just party persons i took pictures with didnt realize how can a simply picture taken in a party or a date can mislead people, friends and family to assume a relation or even sleeping with a person or dating . sometimes you have to be carefull about how you display pictures taken in random places especially if you have a crowd of friends that know each other .
i just want to point out that in alot of sites even in a big network like facebook where search engines can find anyone be carefull about the information you display about your self and even personal pictures.