Home Self explanatory....

FaceBook   Built into the DBs.App so there is no need to open another App. (eg. Facebook App).

YouTube   Built into the DBs.App so there is no need to open another App. (eg. YouTube App).

Twitter   Built into the DBs.App so there is no need to open another App. (eg. Twitter App).

Integration If you have installed main designed app for your device (Installed via iTunes or Cydia and the like). Selecting a link will open the App in order to use its features instead of the DBs.App.

Snap Shot Take a ScreenShot. This helps when you are on a page, and wish to share it with a friend or foe...

Cydia Links Used for installing DBs. packages and Apps.  The links provided will automatically open into Cydia or iTunes depending on the availability. 

ModMyi Links   Packages on ModMyi, as-well as Built into the DBs.App View, so there is no need to open another App. (eg. ModMyi App).