Whatot should be the best design and arrangement of the classes approch

I an developing a dashboard from where one cab share there events into multiple social destinations. I have a folder "vendors" where I have put all the classes of social media. Now I want to develop an adapter like class from where i can access all my social classes. In my adapter class I have already tried to call the classes by name. But with this approach the methods of the different class are not accessing properly.

Please let me know what should be the best approach to access the different classes.