UI improvements for SocialProfile artefact

Bug 1381729:

1. Renaming it on the user side to "Social media"

2. Not asking the user for the network name if they choose a known network type

3. Adding some of the current popular networks to the dropdown list

Change-Id: I7e38656cd174e6d6ccc2c5c61a5c844d207164ab
Merge "UI improvements for SocialProfile artefact"