how to insert Add-Ins properly?

I have tried to add-in feature, but seems not properly added on the articles.

I wanna add Twitter or related news, but how can I acheive this?

Twitter is not available right now. Twitter removed the search feature or at least added javascript protection to it so I can no longer search it and extract posts.

seems top news and other addins also not working well, but I got it.

hope this can be working in the near future