I tested my website with Google PageSpeed Insights.
I did cache optimization in my .htaccess, but it didn't affect resource files that are from Facebook and Google+
Leverage browser caching
http://connect.facebook.net/fr_FR/all.js (20 minutes)
https://apis.google.com/js/plusone.js (30 minutes)
https://oauth.googleusercontent.com/…e:rpc:shindig.random:shindig.sha1.js?c=2 (60 minutes)
What can I do to solve this?