Moreover, we found that using all of the data for learning the embeddings was better than focusing only on users that we target in this study, namely left, right, and news feed, i.e., using the rest of the data adds additional context to the embedding space, and makes the target labels more contextually distinguishable.
for each two users u, v ∈ U , there is an edge in the similarity graph (u, v) ∈ E if u and v share a common hashtag or a common user mention The graph therefore uses the same information that is available to the embeddings.