Flock is a free, open source web browser based on Firefox. Flock is an amazing new web browser that makes it easier to share mediaand connect to other people online. Share photos, automatically stayup-to-date with new content from your favoritesites, and search the Web with the most advanced Search Toolbaravailabletoday. Flock is still in development and will be officially released and added to the Ubuntu
repositories in future.
However, there is no Flock package for Ubuntu Dapper. Therefore youshould install flock by yourself using your terminal. Installing Flockon Ubuntu Dapper is easy;Grab the tarball, unpack it and run the binary. That it 
Screenshot
Flock Browser Menu
Flock Browser Flickr
Flock Browser Blog
Flock Engage
Here are the detail steps to install Flock on Ubuntu Dapper
Download The Flock Installer for Linux
Go to Flock Homepage to get the newest version.
Extract The Flock Installer
Open your terminal and type this following command:
sudo tar -C /opt -zxvf flock-*.linux-i686.tar.gz
Test Flock
Create Link
sudo ln -s /opt/flock/flock /usr/bin/flock
Create Application Menu
sudo vi /usr/share/applications/Flock.desktop
Insert this following text into your new file:
[Desktop Entry]
Comment=Flock Web Browser
Exec=flock
GenericName=Flock Web Browser
Icon=/opt/flock/icons/mozicon128.png
Name=Flock
Path=
StartupNotify=true
Terminal=0
TerminalOptions=
Type=Application
X-KDE-SubstituteUID=false
X-KDE-Username=
Categories=Network;Application;
Refresh Gnome Panel
Well done!
Removing Flock
sudo rm /usr/bin/flock
sudo rm /usr/share/applications/Flock.desktop
sudo rm -rf /opt/flock