The New Scientist article mentions two other social networks $($Twitter $($now $$X$)$ and Mastodon$)$ and more recently $$Threads$($by Meta$)$ has emerged. By referring to Block $3$ Part $5,$ and searching the internet, explain the differences between Mastodon and Twitter$/$X$.$ You may wish to consider aspects such as: aim$/$purpose; user base; functionality; organisation$/$structure; and security$/$privacy$.$