There are several social media platforms that end in "in." Here are some examples:

• LinkedIn: A social networking site designed for professionals to connect with each other, find jobs, and share industry news and insights.

• BeReal: A social media platform that allows users to share photos and videos with their friends and followers.

• Spacehey: A social networking site that aims to recreate the look and feel of Myspace, a popular social media platform from the early 2000s.

• Locket: A social media platform that allows users to share photos and videos with their friends and followers, with a focus on privacy and security.

• StudiVZ: A social networking site popular in Germany, Austria, and Switzerland, designed for students and alumni to connect with each other.

Its worth noting that social media platforms are constantly evolving, and new ones are being created all the time. Some platforms that were once popular, such as Friendster and Google Buzz, have since shut down. Meanwhile, other platforms like TikTok and Twitter are currently experiencing a decline in popularity.