As you're purchasing a portfolio of shares, fixed income, bonds and cash investments, your returns are not tied to one company’s performance (or tweets).
You can view the return of each of the Portfolios when you are first selecting one by following these steps:
Log into the Douugh app.
Tap on 'Invest Jar'.
Tap ‘Discover Portfolios’.
Swipe left/right to the Portfolio you want to check.
Swipe up to view the ‘Annualised Performance’.
Blackrock calculates the percentage figure displayed in the app for each portfolio and you can find further information regarding how your Portfolio’s return is calculated by tapping ‘Learn More at Blackrock’.