Just to keep everyone in the loop on FB:
The Facebook invite system is very sensitive about emails, and forces us to invite through the Facebook messages feature. This makes it hard to send updates, transactional notifications, etc, and many users do not like getting Facebook app invites.
We are still open to doing this down the line, but are making other higher priority changes to the invite system until we know the best way to make this seamless.
You can do invite by Gmail / Yahoo, which uses email addresses and is much easier for us to handle.
We just added a very basic calculator function to our web app, so you can now use basic mathematical operations when entering a cost (addition, subtraction, multiplication, and division). We hope to add similar features to our mobile apps at some point in the future!
Our team is not big enough at the moment to support a Windows 10 app but we will be reviewing this again in the future.
- AaronRenu commented
You should have one to be number one app