Minor fixes in Linkback plugin
Minor fixes in Linkback plugin

foocorp/gnu-social,charnimda/lgbtpzn-social,chimo/social,faulteh/gnu-social,faulteh/gnu-social,charnimda/lgbtpzn-social,chimo/social,faulteh/gnu-social,chimo/social,faulteh/gnu-social,charnimda/lgbtpzn-social,foocorp/gnu-social,foocorp/gnu-social