Social networking spam is detected using usage profiles for social networking groups. A mapping module maps a social networking group with a number of members. A pattern module determines a pattern of publishing activity of the members in posting information on blogs of other of the members. A profiling module defines a group usage profile for the social networking group based on the pattern. Global usage profiles can also be created for the social networking environment. An identification module identifies when a new entry has been posted on a blog of a members of a social networking group. An analysis module analyzes the new entry in comparison to a group usage profile (or other profiles). A determination module determines whether the new entry deviates from the pattern of activity of the members based on the analysis. If the new entry deviates, a spam detection module detects that the new entry is spam.