to an extent, but they are also enabling contact with people you would otherwise not normally interact or meet with.
do it on facebook
facebook.
facebook.com
this is almost like facebook but you can check it out heyspace.webs.com
Creating a like on Facebook isn't done on Facebook. There are different websites where you can type in your like, and it goes to Facebook.
There are many websites similar to Twitter such as Facebook and MySpace.
Social networking websites.
littletag.com
Facebook and twitter