invasion of privacy?

i've been thinking,, is stomp.com.sg an act of invasion of privacy?

stomp.com.sg is a site where singaporeans post photos and videos of "bad acts" by fellow singaporeans.. this bad acts such as ugly commuters and caught in the act.. yes we dont want such stuff happening to us, but do we have the rights to actually film/photograph them?

ok the website might be a legitimate website with nothing wrong, however, people post photos/videos of others whom they might not know on it..

Privacy law is the area of law concerned with the protection and preservation of the privacy rights of individuals.

so do the people who uploaded the photos/videos have the rights to actually film or take pictures of the people in their video or photos?