Facebook allows you to set up a profile, and post updates, links, conversations, events, photos, videos, petitions, or even collect donations online. Users who choose to “like” your organization see updates without needing to navigate to your page, and can get involved in discussions with other supporters. It’s particularly good at increasing the level of feedback and discussion you have with supporters, driving traffic to your website, and attracting people to specific events.
Twitter lets you send out a stream of short messages so that updates about what you’re doing, or links to resources of interest. People can choose to “follow” your tweets in Facebook now, it has similar function which will follow someone by “subscribe” to that person, and if they particularly like one they can “retweet” it.
In LinkedIn, Each person sets up a profile which is similar to a resume, and can then link to other people that they know. LinkedIn is mostly for professionals who want to maintain and develop their professional networks in terms of jobs but Facebook and Twitter are mostly for daily interaction.
So what about MySpace? To me, I know really use MySpace because it’s not popular any more. I know it is similar to Facebook. however, Facebook has seen a huge boom in popularity, and MySpace a substantial decline. and it looks like a blog more!