You are using replace inbox message feature. But your audience has changed and some of the contacts who received the first message do not exist. What would happen?

send multiple emails over a period of 3 months with link to download mobile app. If link clicked then send app feature emails else same mails to download mobile app after every 3 days. How would you design this Multiple select?

In social studio how many columns are used in a engage tab (max 30 tabs in a engage, no limit for columns in each tab) and each column contains max 50 accounts)