[SEC] installer: filter user input

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50025 b456876b-0849-0410-b77d-98878d47e9d5
[SEC] social networks: filter user input

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50026 b456876b-0849-0410-b77d-98878d47e9d5