Conversation Based Features
These features are devoted to exploit the peculiar characteristics of the dataset, which have a tree structure reflecting the conversation thread.

Text Similarity to Source Tweet: Jaccard Similarity of each tweet with its source tweet.

Text Similarity to Replied Tweet: the degree of similarity between the tweet with the previous tweet in the thread (the tweet is a reply to that tweet).

Tweet Depth: the depth value is obtained by counting the node from sources (roots) to each tweet in their hierarchy. 
 Question: What conversation-based features are used?
Text Similarity to Source Tweet Text Similarity to Replied Tweet Tweet Depth