It is a best practice to use this web part sparingly. Using it on every page in your site is cumbersome and adds to "banner blindness" for site visitors. We suggest that you use it mainly on landing pages or About pages and with contact information content.
While the Include Activity Stream function of the web part is a great way to let visitors see some of the content your department, center, or school shares on Facebook; at mobile viewports, the user experience can be less than perfect. This is mainly due to the scroll function of the feed, which, when scrolling with your finger on a smart phone, can lead to confusion for the user. Often when scrolling past the feed to get to the bottom of the page, the user will end up scrolling within the Facebook Web Part instead -- this can be frustrating. We suggest only including the activity stream some of the time, when you think it would most benefit the user. We recommend mainly using the default settings for the web part.
Using the the social media panel object or buttons is a great way to display your social media presence without having a feed.
Note: We see much higher engagement with the buttons than we do with the web part feeds.