@Albertkinng I'm not @mimsical but I'll try:
Simply put, your social graph is the people you interact with. Twitter, BlueSky, FB and all corporate social media algos show you what THEY think will keep you engaged. This causes you to interact more with some and less with others, which changes your social graph.
Mastodon simply shows things in a chronological view. Your social graph is influenced purely by who you follow.
More here: https://en.m.wikipedia.org/wiki/Social_graph
@shrikant @Albertkinng @mimsical thank you, was also wondering. :-)