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Benjamin LedererBenjamin Lederer 

Build a Custom Record Page for Lightning Experience - No Twitter or Activities Component

I can't find the peices necessary (underlined) to complete this trail.
  • Add the following standard components to the page:
    • Highlights Panel
    • Twitter
    • Tabs
  • Update the Tabs component as follows:
    • Add the Activity tab
    • Add the following standard components to each of the tabs:
    • Add the Activities component to the Activity tab
    • Add the Record Detail component to the Details tab
    • Add the Related Lists component to the Related tab
SandhyaSandhya (Salesforce Developers) 

I would suggest you do all the steps given in the content of the unit.Finish Steps under 
Create a Custom Lightning Record Page.Also refer below link.
Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
Best Regards
Benjamin LedererBenjamin Lederer
Yeah, I went through the steps. 

I can't find the Twitter Panel or an Activities Component. 
LAM Jean PaulLAM Jean Paul
Hey everybody, 

About the twitter component i have found how to make it appear ! 

1)Quick find
2) Write "Social"
3)Select "Social Accounts........."
4) Enable "Social Accounts........."

It will automatically enable twitter and YT

User-added image
Andrei MilitaruAndrei Militaru
@Jean Paul, amazing!
Even though it makes perfect sense now, I never would have thought the component is tied to the Social Networks options without your comment.
Thanks a lot, man, I'd chose your answer as best, but I can't since it's not my post.
Good luck!