There are many people that are active on Twitter, including many famous celebrities. President Obama even has a Twitter account.
Twitpic
Twitpic is a service that allows you to share photos on Twitter. You copy and paste the address into your status to share your pictures.
Tumblr
Tumbler is owned by Twitter, it allows people to blog very easily by breaking things into categories. You can post your favorite moments from chat conversations, photos you have found online, or even just write something down.
Tumblr streams your friends’ content on your homepage, making it easy to keep up with them.
Blogger
Blogger is a standard blogging site where you can write journal entries or just everyday observations.
LiveJournal
Windows Spaces Live
Xanga
Picture Sites
TwitPic
Twitpic is a service that allows you to share photos on Twitter. You copy and paste the address into your status to share your pictures.
Flickr
Flickr is a website where you can create online photo albums. It’s targeted at an older set than Photobucket. It’s mainly seen as a site where people can share albums with family or spotlight their photography.
Photobucket
Mostly a place where people can host their pictures that they can post on other websites.