Most likely Facebook expired your third party connection.   (Instagram, Twitter, Facebook, Linkedin, Google, etc do this to third party connections every 60 days or so -- there's no way to stop this, or a connection can be expired upon changing a password). 

The fix is simple!

1. Reconfigure your existing Facebook widget by clicking on the gear icon located at the top right corner of the widget.
2. Click on the Facebook Account drop down and select the first empty entry in the list. Then click on the Add Account button located next to this drop down list.
3. A new popup will open where Facebook will ask you to confirm the connection. Click on the Accept button.
4. The popup will automatically close and you will be back on the widget configuration screen in Cyfe. Now click on the Save Widget button.

You should only have to do this for one widget.

1. First, grant your personal account permission to that Page (see here: https://www.facebook.com/help/18731634131663). Facebook will send you an email where you'll accept the invite.
2. Then, connect your personal account (the one you just accepted the invite for) to the Cyfe widget, and you'll see your Page! :) 

You'll want to confirm that you have admin priviliges to the Facebook Page you are wanting to connect to.

If you still do not see your Facebook Page, re-add your account. This re-authorizes your authentication token. Make sure you add the FB page when authenticating your account.

• "Likes" (also seen on the Overview) will show the fans generated over a period of time based on the Date Picker in your upper right corner.
• "Like Growth" shows the total growth and cumulative total of your Page's fan likes.

"Reach" in Cyfe should match with Facebook: now keep in mind that there's another caveat here. In Cyfe we grab the reach data on a daily basis and add it together to show you the total number, at the top of the widget, for your date range...while Facebook may be showing you the UNIQUE number of people reached for the entire date range (instead of the ABSOLUTE number in Cyfe).

The same also applies to the clicks (for instance in a Facebook Ads widget). The "clicks" you would see in Cyfe are different than "link clicks" that you see in Facebook. Clicks in Cyfe is the total number of clicks on your ad. This may include offsite clicks to your website, Page likes, post comments, event responses or app installs. While Link Clicks (in FB) is the number of clicks on links to select destinations or experiences, on or off Facebook-owned properties.

So essentially you're looking at the same data but both the Cyfe and Facebook UIs are slicing and dicing it a little differently as we have to work around some limitations in Facebook's API.

Here's how we define the various KPIs on our Facebook Pages widget.  This data comes straight from Facebook and they don't often do a great job at clarifying what each precise element means. 
 
Facebook Reach: Number of people who have seen any content associated with your Page.
Facebook Views: Number of times your Facebook Page was loaded by visitors.
Facebook Engaged: Number of people who liked/commented/shared/clicked on your posts. 
Facebook Clicks: Number of times people clicked on content within your Page.
Facebook Likes: Number of times people clicked the Like button on your Page. 
 
Here's the formula we use to calculate Facebook engagement:  
Engagement Rate = People who liked/commented/shared/clicked on your posts (engaged) / People who saw your posts (reach) 

Top Posts by Impressions: The number of impressions for your Page post
Top Posts by Unique Impressions: The number of people who saw your Page post
Top Posts by Paid Impressions: The number of impressions for your Page post in an Ad or Sponsored Story
Top Posts by Fan Impressions: The number of impressions for your Page post by people who have liked your Page
Top Posts by Engaged Users: The number of people who clicked anywhere in your posts 
Top Posts by Negative Feedback: The number of times people took a negative action in your post (e.g. hid it)
Top Posts by Fan Reach: Post reach by people who like your page.