They can also create and join interest groups and "like pages" some of which are maintained by organizations as a means of advertising.
Current crazes include Twitter (launched in March 2006) is an online social networking and microblogging service that enables users to send and read "tweets", which are text messages limited to 140 characters.
Registered users can read and post tweets but unregistered users can only read them.
It has the potential for online bulling and abuse and currently in Dumfries it has become very 'bitchy'.
previously Ask Jeeves (launched on June 16, 2010) is a Latvia-based social networking website where users can ask other users questions, with the option of anonymity.
Twitter has a private message feature but you have to both be following each other for it to be available.