This is great for Avril and generous of Taylor to invite her. I mean the "Taylor liked Avril shade" story wasn't even major and Taylor could have easily ignored it, but instead she apologized and gave Avril opportunity to perform for a big crowd and make some buzz again.
Anyway, didn't all the "Taylor liked tumblr post about M&Gs" start here on ATRL? I remember some member went through her likes and then made thread here and other fans sent it to Avril. ATRL's impact