Can you ask for people to do stuff in a contest?

[Czarek]

Let's say I'd make a contest that would run for 2 weeks where people would be required to have a signature of my choice for the time of the contest running.

Is that fine or is it against the rules?

 

[Ivain]

I believe this is allowed. Asking for reactions or stuff like likes on social media is not allowed, unless the rule was changed, then the latter is allowed (the former is definitley not).